As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT # 771, BOS-CUN. MUSTY SMELL OR SMELLY SOCK SMELL OBSERVED DURING DESCENT AT APPROXIMATELY 8000FT AND REMAINED STRONG WHILE PARKED AT GATE FLT CREW OBSERVED IN COCKPIT AND INFLIGHT NOTICED IN BOTH FWD AN AFT GALLEYS. NO VISIBLE SMOKE OR CONDENSATION OBSERVED; PERFORMED SECTION 8B FOUND OIL LEVEL APU AND ENGINES NORMAL. IAW 2017-T01SI A/C OK FOR SVC