As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: 3 HOURS INTO FLIGHT, FORWARD /MID LAVATORY FIRE WARNING ECAM. FLIGHT ATTENDANTS REPORTED NO ODOR OR SIGNS OF SMOKE OR VAPING IN ANY LAVATORY AT THE TIME OF THE ECAM. MAINTENANCE CHECKED ALL LAVATORY SMOKE DETECTORS FOR ABNORMALITY, PHYSICAL APPEARNCE AND CONTAMINATION WITH NO FAULTS NOTED. ALSO ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK OF THE LAVATORY SMOKE DETECTION SYSTEM PER TSM 26-17-00-810 WITH NO ISSUES NOTED.