As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: RED ECAM SMOKE - LAVATORY SMOKE APPEARED FOR APPROXIMATELY 5 SECONDS IN DESCENT PASSING FL280. FLIGHT ATTENDANT REPORTED LAVATORY WAS OCCUPIED AT THE TIME, BUT NO INDICATION OF SMOKE IN THE LAVATORY. THE ECAM WENT AWAY ON ITS OWN. MAINTENANCE PERFORMED A SATISFACTORY TEST SDF PER AMM 26-12-00.