As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THERE WAS A SMALL FIRE OR SMOLDER IN 4R LAV TRASH BIN, IT WAS PUT OUT PROMPTLY BY THE FLIGHT ATTENDANT. NO DAMAGE VISABLE IN CAN. THE SMOKE ALARM DID NOT GO OFF. TESTED SMOKE DETECTOR ON ARRIVAL, CHECKED OK. NO EVIDENCE OF FIRE OR BURNED MATERIAL. TRASH COMPARTMENT AND CONTAINER IN SERVICABLE CONDITION. REPLACED SMOKE DETECTOR PRECAUTIONARY.