Botsford, J.
INTRODUCTION
Jere Pelletier (“Pelletier”), a former firefighter in the City of Lynn, seeks judicial review of a Contributory Retirement Appeal Board (“CRAB”) decision dated February 18, 1994. In its decision CRAB upheld the suspension of Pelletier’s accidental disability retirement benefits by the Lynn Retirement Board (“the Lynn board” or “the board”). Pelletier appeals pursuant to G.L.c. 30A, §14, claiming that CRAB committed an enror of law in affirming the Lynn board’s suspension. For the reasons discussed below, this matter is [396]*396to be remanded to CRAB for further proceedings consistent with this decision.
BACKGROUND
I take the facts, which are not in dispute, from the decision of the administrative magistrate from the Division of Administrative Law Appeals.
Pelletier worked as a firefighter for Lynn from 1977 to June 30, 1984, when he was retired for accidental disability due to a knee injury, based on an involuntary application filed by the Lynn fire chief. In 1985, after his disability retirement, Pelletier moved to Florida where he held several jobs before returning to New England. The jobs included six months at a golf club as a ranger/starter; two sales positions with car dealers; and a job with American Fire and Safety Film. He was terminated from all or most of these jobs because of attendance problems due to his injured knee.
Pelletier returned to New England in December, 1989 and in early 1991, he took a position with Peachtree Bank Services as an independent salesperson, but was again terminated because of physical pain and incapacity related to his knee. At the time of the proceedings before the Lynn board as well as CRAB, Pelletier no longer held that position and was unemployed.
In June, 1990, the Lynn board performed a “desk review” of Pelletier’s file pursuant to 840 Code Mass. Regs. §10.15, to determine what Pelletier’s earning capacity was and to determine whether he “would be in line for a rehab program.” (Administrative Record (“A.R.”], p. 67.) In February, 1991, the Lynn board had Pelletier re-examined by a regional medical panel pursuant to G.L.c. 32, §8(1). The panel reported that although Pelletier “continues to have significant symptoms relative to the right knee,” it could “not find evidence on physical examination or by x-ray, to support Pelletier’s continuing symptoms.” The panel concluded that Pelletier could return to firefighting work without restriction. Having so found, the panel did not consider whether and what type of occupations other than firefighting Pelletier might be able to engage in. (See A.R., p. 31.)
On November 6, 1991, the Lynn board conducted a hearing to determine “whether [Pelletier] should be re-employed according to the law.” Pelletier explained to the board that he could not perform the work of a firefighter because his knee pain was intermittent and disabling and he could not climb ladders or do strenuous physical work. On February 4, 1992, Pelletier was informed by the Lynn board that his name would be placed on a list for rehiring as a firefighter for nine months, and if at the end of nine months no position was available to him, his pension would be modified “based on the fact that [he] could be earning [the] salary [of a firefighter], in accordance with Chapter 32 Sec. 8 (3).” (A.R., p. 62.)
On February 6, 1992, the Lynn fire chief informed the Lynn board that he would “not . . . accept Jere Pelletier back as a member of the Lynn Fire Department. My decision is based on my policy of not reinstating members who have retired on a disability-pension.” (A.R., p. 79.)
By letter of December 11, 1992, the Lynn Board again wrote to Pelletier, informing him that he had been on the re-hiring list for nine months (without being re-hired), and that “[therefore, effective January 1, 1993, your monthly pension check will be modified/suspended.” Consistent with this letter, in January, 1993, Pelletier received a check for $46.00. His pension prior to the “modification/suspension” was $1,470.00 per month.
Pelletier appealed the Lynn board’s decision to CRAB pursuant to G.L.c. 32, §16(4). An evidentiary hearing was held before a magistrate of the Division of Administrative Law Appeals on May 5, 1993. In a decision dated July 15, 1993, the magistrate overturned the Lynn board’s decision and ordered Pelletier’s pension restored retroactively to January, 1993. She concluded that the Lynn board failed to modify Pelletier’s retirement allowance in accordance with G.L.c. 32, §8(3) (sic)2 and applicable regulations, 840 Code Mass. Regs. §10.18(6).
The Lynn board appealed the administrative magistrate’s decision to CRAB. On February 18, 1994, CRAB issued a final decision adopting all the magistrate’s finding of facts, but affirming the Lynn board’s suspension of Pelletier’s retirement pension. CRAB concluded that because Pelletier was determined to be capable of returning to work as a firefighter, it was proper to discontinue his pension under c. 32, §8(3) and 840 Code Mass. Reg. §10.19 since he had “potential earnings in an amount equal to the salary of a firefighter.” (A.R., p. 2.) On March 17, 1994, Pelletier filed this complaint for judicial review of CRAB’S decision under G.L.c. 30A, §14.
DISCUSSION
The party appealing an administrative decision bears the burden of demonstrating the decision’s invalidity. Merisme v. Board of Appeals on Motor Vehicle Liab. Policies & Bonds, 27 Mass.App.Ct. 470, 474 (1989); Faith Assembly of God v. State Bldg. Code Comm’n, 11 Mass. App. Ct. 333, 334 (1981), citing Almeida Bus Lines Inc. v. Department of Pub. Utils., 348 Mass. 331, 342 (1965). In reviewing the agency decision, the court is required to give due weight to the agency’s experience, technical competence, specialized knowledge, and the discretionary authority conferred upon it by statute. Flint v. Commissioner of Pub. Welfare, 412 Mass. 416, 420 (1992); Seagram Distillers Co. v. Alcoholic Beverages Control Comm’n., 401 Mass. 713, 721 (1988); Quincy City Hosp. v. Labor Relations Comm’n, 400 Mass. 745, 748-49 (1987). The reviewing court may not substitute its judgment for that of the agency. Southern Worcester County Regional Voca[397]*397tional School Dist. v. Labor Relations Comm’n, 386 Mass. 414, 420-21 (1982), citing Olde Towne Liquor Store, Inc. v. Alcoholic Beverages Control Comm’n, 372 Mass. 152, 154 (1977).
Nevertheless, the court is not bound by an administrative decision that was based on an error of law. Bagley v. Contributory Retirement Appeal Board, 397 Mass. 255, 259 and n. 5 (1986). See Retirement Board of Brookline v. Contributory Retirement Appeal Board, 33 Mass.App.Ct. 478, 480 (1992), citing Robinson v. Contributory Retirement Appeal. Board, 20 Mass.App.Ct. 634, 636 (1985).
In this case, Pelletier argues that G.L.c. 32, §8(2) (“§8(2)’3 properly governs his case because that is the section of the retirement law that is intended to apply to public employees retired on a disability who, like Pelletier, have been deemed by a medical panel to be “physically able to return to the same or a similar position”; and because the Lynn board in fact did apply §8(2) to him in the first instance. Pelletier contends that CRAB committed on error of law in relying on G.L.c. 32, §8(3) (“§8(3)’4
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Botsford, J.
INTRODUCTION
Jere Pelletier (“Pelletier”), a former firefighter in the City of Lynn, seeks judicial review of a Contributory Retirement Appeal Board (“CRAB”) decision dated February 18, 1994. In its decision CRAB upheld the suspension of Pelletier’s accidental disability retirement benefits by the Lynn Retirement Board (“the Lynn board” or “the board”). Pelletier appeals pursuant to G.L.c. 30A, §14, claiming that CRAB committed an enror of law in affirming the Lynn board’s suspension. For the reasons discussed below, this matter is [396]*396to be remanded to CRAB for further proceedings consistent with this decision.
BACKGROUND
I take the facts, which are not in dispute, from the decision of the administrative magistrate from the Division of Administrative Law Appeals.
Pelletier worked as a firefighter for Lynn from 1977 to June 30, 1984, when he was retired for accidental disability due to a knee injury, based on an involuntary application filed by the Lynn fire chief. In 1985, after his disability retirement, Pelletier moved to Florida where he held several jobs before returning to New England. The jobs included six months at a golf club as a ranger/starter; two sales positions with car dealers; and a job with American Fire and Safety Film. He was terminated from all or most of these jobs because of attendance problems due to his injured knee.
Pelletier returned to New England in December, 1989 and in early 1991, he took a position with Peachtree Bank Services as an independent salesperson, but was again terminated because of physical pain and incapacity related to his knee. At the time of the proceedings before the Lynn board as well as CRAB, Pelletier no longer held that position and was unemployed.
In June, 1990, the Lynn board performed a “desk review” of Pelletier’s file pursuant to 840 Code Mass. Regs. §10.15, to determine what Pelletier’s earning capacity was and to determine whether he “would be in line for a rehab program.” (Administrative Record (“A.R.”], p. 67.) In February, 1991, the Lynn board had Pelletier re-examined by a regional medical panel pursuant to G.L.c. 32, §8(1). The panel reported that although Pelletier “continues to have significant symptoms relative to the right knee,” it could “not find evidence on physical examination or by x-ray, to support Pelletier’s continuing symptoms.” The panel concluded that Pelletier could return to firefighting work without restriction. Having so found, the panel did not consider whether and what type of occupations other than firefighting Pelletier might be able to engage in. (See A.R., p. 31.)
On November 6, 1991, the Lynn board conducted a hearing to determine “whether [Pelletier] should be re-employed according to the law.” Pelletier explained to the board that he could not perform the work of a firefighter because his knee pain was intermittent and disabling and he could not climb ladders or do strenuous physical work. On February 4, 1992, Pelletier was informed by the Lynn board that his name would be placed on a list for rehiring as a firefighter for nine months, and if at the end of nine months no position was available to him, his pension would be modified “based on the fact that [he] could be earning [the] salary [of a firefighter], in accordance with Chapter 32 Sec. 8 (3).” (A.R., p. 62.)
On February 6, 1992, the Lynn fire chief informed the Lynn board that he would “not . . . accept Jere Pelletier back as a member of the Lynn Fire Department. My decision is based on my policy of not reinstating members who have retired on a disability-pension.” (A.R., p. 79.)
By letter of December 11, 1992, the Lynn Board again wrote to Pelletier, informing him that he had been on the re-hiring list for nine months (without being re-hired), and that “[therefore, effective January 1, 1993, your monthly pension check will be modified/suspended.” Consistent with this letter, in January, 1993, Pelletier received a check for $46.00. His pension prior to the “modification/suspension” was $1,470.00 per month.
Pelletier appealed the Lynn board’s decision to CRAB pursuant to G.L.c. 32, §16(4). An evidentiary hearing was held before a magistrate of the Division of Administrative Law Appeals on May 5, 1993. In a decision dated July 15, 1993, the magistrate overturned the Lynn board’s decision and ordered Pelletier’s pension restored retroactively to January, 1993. She concluded that the Lynn board failed to modify Pelletier’s retirement allowance in accordance with G.L.c. 32, §8(3) (sic)2 and applicable regulations, 840 Code Mass. Regs. §10.18(6).
The Lynn board appealed the administrative magistrate’s decision to CRAB. On February 18, 1994, CRAB issued a final decision adopting all the magistrate’s finding of facts, but affirming the Lynn board’s suspension of Pelletier’s retirement pension. CRAB concluded that because Pelletier was determined to be capable of returning to work as a firefighter, it was proper to discontinue his pension under c. 32, §8(3) and 840 Code Mass. Reg. §10.19 since he had “potential earnings in an amount equal to the salary of a firefighter.” (A.R., p. 2.) On March 17, 1994, Pelletier filed this complaint for judicial review of CRAB’S decision under G.L.c. 30A, §14.
DISCUSSION
The party appealing an administrative decision bears the burden of demonstrating the decision’s invalidity. Merisme v. Board of Appeals on Motor Vehicle Liab. Policies & Bonds, 27 Mass.App.Ct. 470, 474 (1989); Faith Assembly of God v. State Bldg. Code Comm’n, 11 Mass. App. Ct. 333, 334 (1981), citing Almeida Bus Lines Inc. v. Department of Pub. Utils., 348 Mass. 331, 342 (1965). In reviewing the agency decision, the court is required to give due weight to the agency’s experience, technical competence, specialized knowledge, and the discretionary authority conferred upon it by statute. Flint v. Commissioner of Pub. Welfare, 412 Mass. 416, 420 (1992); Seagram Distillers Co. v. Alcoholic Beverages Control Comm’n., 401 Mass. 713, 721 (1988); Quincy City Hosp. v. Labor Relations Comm’n, 400 Mass. 745, 748-49 (1987). The reviewing court may not substitute its judgment for that of the agency. Southern Worcester County Regional Voca[397]*397tional School Dist. v. Labor Relations Comm’n, 386 Mass. 414, 420-21 (1982), citing Olde Towne Liquor Store, Inc. v. Alcoholic Beverages Control Comm’n, 372 Mass. 152, 154 (1977).
Nevertheless, the court is not bound by an administrative decision that was based on an error of law. Bagley v. Contributory Retirement Appeal Board, 397 Mass. 255, 259 and n. 5 (1986). See Retirement Board of Brookline v. Contributory Retirement Appeal Board, 33 Mass.App.Ct. 478, 480 (1992), citing Robinson v. Contributory Retirement Appeal. Board, 20 Mass.App.Ct. 634, 636 (1985).
In this case, Pelletier argues that G.L.c. 32, §8(2) (“§8(2)’3 properly governs his case because that is the section of the retirement law that is intended to apply to public employees retired on a disability who, like Pelletier, have been deemed by a medical panel to be “physically able to return to the same or a similar position”; and because the Lynn board in fact did apply §8(2) to him in the first instance. Pelletier contends that CRAB committed on error of law in relying on G.L.c. 32, §8(3) (“§8(3)’4 to affirm the Lynn board’s decision; that section, he states, was intended to apply only to disability-retired employees who have been found by a retirement board to be either presently engaged in gainful employment other than the position they held before retirement, or able to engage in such other employment.
I agree that §8(2) is the provision in G.L.c. 32, §8 which properly governed the Lynn board’s actions in this case, and that §8(3) could not be applied to him on the record presented. By its terms, §8(2) applies to situations where a retirement board determines, based on the report of a medical panel, that a disability-retired employee’s physical condition has so changed that he is currently able to return to the same position as the one he held before retirement, or a position similar to it. See id., first paragraph. That is precisely what occurred here: the medical panel, in its report of February 7, 1991, determined that Pelletier could return to his prior position as a firefighter without restriction (A.R., pp. 30-34); and there is no dispute that the Lynn board adopted the panel’s determination.
Section 8(2) (a) provides comprehensive direction for implementing a retirement board’s decision that a particular employee should be restored to active service. First, if there is a job opening available for the same position as or similar to the one the employee had filled before his disability retirement, and if the head of the department in which the vacancy occurs approves, the board may order the employee to be reinstated into that position (§8(2)(a), first paragraph.) Second, if there is no job opening or vacancy available, or if the department head does not approve the employee’s reinstatement,5 then the employee is to continue receiving his retirement allowance until reinstatement occurs (id., third paragraph), except that (a) the retirement board may require the employee to be re-examined by the medical panel (id., third paragraph), and (b) if the employee is not restored to active service within nine months, and the board finds that the employee is employed and that his actual earnings combined with his retirement allowance are greater than the employee’s compensation in his prior position, then the board may suspend or reduce the allowance (id., fourth paragraph).
Since §8(2) applied in this case, the Lynn board, and CRAB in review, was obligated to comply with its provisions. The Lynn board initially did so, paying Pelletier’s retirement allowance for the nine months following its decision, while at the same time placing Pelletier on the “re-hire” list. (See §8(2)(a), fourth paragraph.)
The problematic action taken by the Lynn board in relation to Pelletier, affirmed by CRAB on review, occurred at the end of the nine month period. As indicated above, §8(2)(a), fourth paragraph, states what is to happen at that time: after nine months, if there is no vacancy in the same position as or one similar to the job the retired employee had held, the local board should determine whether the retired employee “is engaged in a gainful occupation” and receiving “actúale arnings” (emphasis supplied) which, when combined with his retirement allowance exceed the compensation he would be receiving if reinstated in his former public employment; if such a determination is made, the board may reduce the retirement allowance to the extent needed to ensure that no such excess occurs. In contrast to §8(3)(discussed below), §8(2) makes absolutely no reference to “potential earnings” in its fourth paragraph or anywhere else. The focus is on “actual earnings” only, and I decline to read in any additional language. See Beeler v. Downey, 387 Mass. 609, 616-17 (1982) (where legislature has used specific language in one paragraph of a statute and not in another, the language should not be implied where it is not present). Moreover, §8(2) does not describe any circumstance other than the employee’s receipt of “actual earnings” which would authorize the board to adjust the employee’s disability pension. As a consequence, the conclusion seems inescapable that where a retired employee whom a retirement board has determined fits under §8(2) is not in fact receiving “actual earnings” in another occupation at the end of the nine month period, the employee is to continue to receive his retirement allowance in accordance with §8(2)(a), third paragraph, until he is reinstated or until a re-examination by a medical panel suggests or permits some other course of action.
The Lynn board did not follow this course. At the close of the nine-month period, the board ignored the applicable provisions of §8(2) just discussed and directly — with no referral of Pelletier for re-examination by a medical panel or further administrative proceedings of any sort — suspended Pelletier’s pension under [398]*398§8(3) because of his “potential” earnings as a firefighter. In affirming this action, CRAB reasoned that since the Lynn board had determined (based on the medical panel’s report) that Pelletier could return to work as a firefighter, he definitely was able to “engage in gainful occupation,” and his potential earnings were exactly the same as his compensation would have been if he had been reinstated in his old job. Accordingly, CRAB concluded that “(s]ince a disability pension is 72% of the retiree’s salary, in this case the potential earnings of [Pelletier] exceed his pension and his pension is to be suspended.” (A.R., p. 2; see A.R., p. 62.) CRAB’s reasoning and conclusion are premised on an error of law: on the basis of the administrative proceedings and record before the Lynn board, that board could not permissibly resolve Pelletier’s entitlement to a disability retirement allowance under the provisions of §8(3).
Section 8(3) is a separate and independent provision from §8(2). Its text, ánd a reading of its terms in conjunction with §8(2), make plain that §8(3) is to-apply only in cases where a retirement board determines a retired employee is able to work, but not able to do so in the same or similar position to the one he held before his disability retirement.
Section §8(3) provides that the local board is to reduce a public employee’s retirement allowance where it finds — based on the report of a medical panel, the employee’s submission of earnings information, or the employee’s completion of a rehabilitation program — that the employee is (1) able to work, and (2) “the annual rate of his actual or potential earnings is less than his regular compensation . . . but. . . more than the difference between such regular compensation and the normal yearly amount of his retirement allowance . ..” (emphasis supplied); §8(3) further provides that the board may suspend the employee’s pension completely if it finds that his “actual or potential earnings are more than [his] regular compensation . . .” The term “regular compensation” is defined in §8(3) to mean “regular compensation which would have been payable during the preceding year had the [employee] continued in service in the grade held by him at the time he was retired." These references to actual or potential earnings which are less or more than the retired employee’s “regular compensation" indicates that the “gainful occupation” the local board might find the employee able to engage in is certainly not his former position, for which he would presumably receive his “regular compensation” exactly — not more, and not less.6
The comparison of §8(3) with §8(2) makes the point even more clearly. As discussed above, §8(2) deals specifically and comprehensively with the actions a local board is to take in handling the pension of a retired public employee whom the board has determined is capable of returning to his former position or one similar to it. Section 8(3) contains no explicit reference whatsoever to such an employee. In light of the detail of §8(2), it must be assumed that if the legislature intended §8(3) to apply as well to such an employee, it would have said so; the absence of any reference must be given effect. See Negron v. Gordon, 373 Mass. 199, 204-05 (1977).7
Apart from the specific words and terms used in §§8(2), 8(3) and the implementing regulations, basic considerations of common sense and fairness support the conclusion that §8(3) does not apply to an employee whom a retirement board has found able to return to his former position. If such an employee were not reinstated in his position or a similar one within nine months after the board made such a finding, it would be either on account of his refusal to do so — a circumstance specifically addressed in §8(2) — or because there was no suitable position available for him to be reinstated in. If indeed the employee’s former job or one similar to it is not available, it is illogical as well as unfair to treat the employee, for retirement benefits purposes, as though he were nevertheless reinstated— by classifying him as having “potential” earnings that are the same as the salary he would receive if he were back in his old job, and therefore no longer entitled to receive disability retirement benefits.
Pelletier falls into the category of employee just described. He was not reinstated as a firefighter in Lynn because the fire chief refused to do so, and he was not offered any other public employment similar to his old position. In fact, he was unemployed at the time of all administrative proceedings. It is only cynical to conclude that in these circumstances the potential earnings of a firefighter should be attributed to him, leaving him with no retirement benefits at all.
In sum, given (1) the Lynn board’s determination that Pelletier could return to work as a firefighter; (2) the refusal of the Lynn fire chief to reinstate Pelletier; (3) the apparent inability of the Department of Personnel Administration to reinstate Pelletier in a suitable vacancy;8 and (4) the absence of any determination by the board that Pelletier was employed and actually earning money which, when added to his retirement allowance exceeded his “regular compensation,” the Lynn board was obligated by the provisions of §8(2) and implementing regulations to retain Pelletier on a reinstatement or “re-hire” status and to continue paying his retirement allowance.9 CRAB erred in upholding the Lynn board’s disposition of this case; in accordance with the recommendation of the administrative magistrate, CRAB should have ordered the Lynn board to reinstate Pelletier’s retirement allowance, effective January, 1993.
ORDER
For the foregoing reasons, the decision of the Contributory Retirement Appeal Board is vacated, and the case is'remanded to that board, which is to order the Lynn Retirement Board to reinstate the retirement allowance of Pelletier effective January, 1993.