Sec. 6.05. CONTINUATION AFTER FIRST 2-1/2 YEARS. After a retiree has received disability retirement benefits from the fund for at least 2-1/2 years, the board of trustees from time to time may review the situation of the person to determine the status of the disability. The board of trustees may ask the medical board for its opinion of the status of the disability. If the board of trustees determines that the person has recovered to the extent that the person is able to be employed, the board of trustees may:

(1) continue to pay the full disability retirement benefit;

(2) pay a reduced disability retirement benefit in an amount commensurate with the person's disability as determined by the board; or

(3) discontinue payment of a disability benefit.