As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IR- AFTER LANDING LAV SMOKE ANNUNCIATES FOR 10 SECONDS WITH HIGH PITCED TONE IN 4R LAV. INSPECTED 4R LAV. NO EVIDENCE OF SMOKE. HIGH PITCHED WHINE FOUND TO BE AFT GALLEY CHILLER VENT FAN. PULLED AND COLLARD C/B FWD TO MCO AND PLACARDED.