As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: SMOKE LAVATORY SMOKE ECAM DURING CRUISE LASTED A FEW SECONDS THEN WENT OUT ON ITS OWN FLIGHT ATTENDANTS REPORTED NO EVIDENCE OF SMOKING/VAPING. MAINTENANCE ACCOMPLISHED LAVATORY SMOKE DETECTOR SYSTEM OPERATIONAL CHECK PER AMM 26-17-00 WITH NO FAULTS NOTED.