As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: DURING FLIGHT LAVATORY SMOKE ECAM FOR APPROX 1 SECOND THEN EXTINGUISHED. FLIGHT ATTENDANTS CHECKED LAVATORIES NO SMOKE OR OCCUPANTS. MAINTENANCE ACCOMPLISHED A SATISFACTORY LAVATORY SMOKE TEST WITH NO FAULTS NOTED.