As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: IN CRUISE FLIGHT ECAM MESSAGE SMOKE LAVATORY CAME ON MOMENTARILY. CABIN CREW UNABLE TO CONFIRM. NO LAVATORY FIRE EXTINGUISHERS DISCHARGED. MAINTENANCE ACCOMPLISHED LAVATORY SMOKE DETECTOR AND LAVATORY SMOKE WARNINGS WITHOUT FIRES TESTS PER TSM 26-17-00 WITH NO FAULTS DETECTED.