What was found
DURING CRUISE ON FLT 9518, ORD-CUN, AUTO PILOT NR 2 (AP2) FAULTED. UPON ARRIVAL IN CUN, DEFERRED PER MEL 22-83-01. REPLACED FMGC NR 2 IN ORD ON DEC. 9, 2002 IAW AMM 22-83-34-400-001. AFS TEST OK PER AMM 22-96-00-710-001. AIRCRAFT RETURNED TO SERVICE.