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 NO ACTUAL SMOKE IN AFFECTED LAVATORY. ACCOMPLISHED TSM 26-17-00-810-804-A NO FAULTS NOTED NO CLASS III FAULTS MESSAGE. CLEANED AFT LAVATORY SMOKE DETECTION FILTERS PER AMM 26-17-15.