As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOR APPROXIMENTLY 30 SECONDS LAV SMOKE MASTER WARNING. COMMUNICATED WITH FLIGHT ATTENDANT PASSENGER WAS IN LAV, PASSENGER EXITED LAV. LAV SMOKE MASTER WARNING CEASED. REMOVED FROM SERVICE. PERFORMED GVI OF LAVATORY & SURROUNDING AREA, NO SIGNS OF DAMAGE OR DEFECTS NOTED. C/W FIM TASK 26-14-00-810-803-A OPS TEST GOOD. RETURNED TO SERVICE. NO PARTS REPLACED.