As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ECAM SMOKE LAVATORY A SMOKE IN FLIGHT. FLIGHT ATTENDANT CHECKED; NO SMOKE OBSERVED. REPEATED SEVERAL TIMES DURING FLIGHT AND AFTER LANDING. REPLACED LAVATORY A SMOKE DETECTOR, PERFORMED FULL CIDS SYSTEM RESET, OPERATIONAL CHECK NORMAL, FAULT CLEARED PER AMM 26-17-15.