53 Pa. Stat. § 23610
A member of the fund who has severed his connection therewith and has subsequently again become eligible for membership therein shall, in addition to a readmission fee of five dollars, be required to return to the fund such dues as were repaid to him from the fund when his membership in the fund was severed.
Such refund shall be collected from the monthly wages of the reinstated member over the period of a year, and full payment thereof shall be a condition precedent to the member being eligible to the benefits of the fund.
Any person previously on retirement who is re-employed and reinstated as a member of the fund shall, at the time of his later retirement, be entitled to any increase in pension which has been provided for by amendments to the law prior to such later retirement.
If, however, any such reinstated member shall be totally and permanently disabled in line of duty before he shall have made such full restitution and before the expiration of the one year period, he shall be eligible to pension under this act; but any amount to which he shall have been indebted to the fund at the date of his injury shall be repaid, if the board, in its discretion, shall so require, in such monthly payments as said board may determine, which amounts shall be deducted from his pension as and when monthly payments thereof shall be made.
53 P.S. § 23610