As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. DURING DESCENT, LAVATORY SMOKE INDICATION ON ECAM . FLIGHT ATTENDANTS SAID THE LIGHT WAS ON AT AFT LEFT LAVATORY. NO SMOKE FOUND, LIGHT STAYED ON FOR ABOUT 10 SECONDS. MAINTENANCE ACCOMPLISHED RESET AND TESTING OF LAVATORY SMOKE DETECTION SYSTEM PER AMM 26-17-00.