As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: ECAM FOR SMOKE DETECTION IN AFT LAVATORY, ALSO DISPLAYED ON FLIGHT ATTENDANTS SCREEN. NO SMOKE ALARM OBSERVED IN EITHER AFT LAVATORY BY FLIGHT ATTENDANTS. ECAM WENT OUT WITHIN ABOUT 30 SECONDS AND CLEARED FROM FLIGHT ATTENDANTS PANEL. MAINTENANCE ACCOMPLISHED TEST OF THE LAVATORY SMOKE DETECTION SYSTEM WITH NO FAULTS NOTED.