As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: MASTER WARNING AND LAVATORY SMOKE ECAM ACTIVATION 3 HOURS INTO FLIGHT. IMMEDIATELY WENT OUT. NO INDICATIONS OF SMOKE IN ANY LAVATORIES. MAINTENANCE PERFORMED CIDS BITE TEST WITH NO DEFECTS NOTED PER AMM 23-73-34.