As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: LAVATORY SMOKE DETECTOR AT L2 ALARM. LAVATORY SMOKE DETECTOR ECAM ALARM IN THE COCKPIT FOR ABOUT 2 SECONDS CLEARED.CONSIDERED IT A FALSE WARNING COULD NOT DETECT SMOKE MAINTENANCE ACCOMPLISHED OPERATIONAL TEST OF THE LAVATORY SMOKE DETECTION SYSTEM PER AMM 26-17-00. NO FAULTS