Sec. 4.08. PURCHASE OF SERVICE CREDIT PREVIOUSLY REFUNDED. (a) A member who received a refund under Section 4.07 of this Act of contributions made for a prior period of employment may reestablish service credit for that prior period of employment by paying to the fund a lump sum equal to the amount of the refund the member received under Section 4.07 of this Act, plus interest on the amount at the actuarial assumed rate of return, as established by the board, from the date the member received the refund to the date the member makes the lump-sum payment.

(b) A member must make the lump-sum payment under this section within a period of days after the date the member is reemployed that is equal to three times the number of days of the period beginning on the date the member terminated the member's prior employment and ending on the date the member is reemployed, provided that the period for making the lump-sum payment may not exceed five years.

(c) The member must file with the secretary of the board a written statement of intent to make the lump-sum payment under this section not later than the 90th day after the date the member is reemployed, except that a member who is reemployed before October 1, 2003, must file the statement on or before December 31, 2003.