As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: AT FL320 FORWARD LAVATORY SMOKE WARNING ECAM ALERT FOR 3 SECONDS. MASTER WARNING LIGHT DEPRESSED AND ALERT CLEARED ITSELF. FLIGHT ATTENDANT CONFIRMED NO SMOKE. MAINTENANCE PERFORMED AN OPERATIONAL CHECK OF THE LAVATORY A SMOKE DETECTOR WITH NO FAULTS NOTED PER AMM 26-12-00.