As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT THE AFT LEFT LAV SMOKE DETECTOR WAS CHIMING IN FLIGHT. NO SMOKE OR FIRE OBSERVED. CREW REPORTED AN ALERT 8 UPON SCHEDULED ARRIVAL INTO JFK. INSPECTED AND FOUND SMOKE DETECTOR FAULTY. REPLACED SMOKE DETECTOR AND ALL CHECKED NORMAL. NO SMOKE OR EVIDENCE OF FIRE PRESENT. SYSTEM GROUND CHECK NORMAL OPERATION.