As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: LAVATORY SMOKE WARNING FOR APPROXIMATELY 4 SECONDS. FLIGHT ATTENDANT CONFIRMED NO ACTUAL SMOKE IN AFFECTED LAVATORY. MAINTENANCE ACCOMPLISHED RESET OF THE SMOKE DETECTION SYSTEM AND NO DEFECTS NOTED PER AMM 26-17-00.