As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIOR TO DEPARTURE OF FLT 308 IN BWI (BWI-CUN), THE NR 2 FMGC (FLIGHT MANAGEMENT GUIDANCE COMPUTER) WENT INOP (ECAM MESSAGE AP2 & CAT 3 DUAL INOP). THE NR 2 FMGC WAS DEFERRED PER MEL 22-83-01. THE NR 2 FMGC WAS REPLACED IAW AMM 22-83-34-401 AND OPS CK'D OK 2 LEGS LATER WHEN THE AIRCRAFT RETURNED TO BWI. THE AIRCRAFT WAS RETURNED TO SERVICE.