As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GNDED. LAVATORY FIRE SMOKE ALARM APPEARED ON ECAM WITH AURAL CHIME. FLIGHT ATTENDANT REPORTED NO SMOKE OR FIRE IN LAVATORY A. PERFORMED TSM PROCEDURE 26-17-00-810-815-A & NO FAULTS WERE NOTED & SYS OPERATIONAL CHECKED GOOD.