As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CDG - CREW REPORTED LAVATORY SMOKE DETECTOR IN LAV FS3 WENT OFF. FLIGHT ATTENDANT RESET DETECTOR AND WORKED NORMAL THE REMINDER OF FLIGHT. NO SMOKE REPORTED IN LAVATORY. SMOKE DETECTOR CAME ON AGAIN AFTER TOUCHDOWN. FLIGHT LANDED CDG WITHOUT INCIDENT. REPLACED LAVATORY FS3 SMOKE DETECTOR. SYSTEM GROUND CHECK NORMAL OPERATION.