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 CRUISE ECAM WARNING SMOKE LAVATORY SMOKE WHICH SELF EXTINGUISHED AFTER 5-10 SECONDS. THE FLIGHT ATTENDANTS INVESTIGATED AND WERE NOT ABLE TO FIND THE LOCATION OF THE DETECTOR TRIGGERED NOR THE CAUSE OF THE ALARM. MAINTENANCE ACCOMPLISHED OPERATIONAL TEST OF LAVATORY SMOKE DETECTION SYSTEM PER AMM 26-17-00 WITH NO FAULTS OR MESSAGES NOTED.