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 ECAM DURING CRUISE. FLIGHT ATTENDANT SUSPECTED PASSENGER VAPING IN LAVATORY E BUT COULD NOT CONFIRM. NO EVIDENCE OF SMOKE IN LAVATORY E. MAINTENANCE PERFORMED CIDS LAVATORY SMOKE WARN TEST. TESTED OK.