As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ECAM WARNING, SMOKE IN LAVATORY. AIRCRAFT RETURNED TO DEPARTURE TERMINAL. MAINTENANCE TECHS OPERATED BOTH AIR CONDITIONERS FOR 30 MINUTES AND WERE UNABLE TO DUPLICATE PROBLEM, NO EVIDENCE OF SMOKE. LAVATORY SMOKE DETECTION SYSTEM CHECKED SERVICEABLE.