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 LIGHT CAME ON FOR ABOUT 20 SECONDS AND THEN STOPPED FLIGHT ATTENDANT SAID THERE WAS NO EVIDENCE OF SMOKE IN LAVATORY. ACCOMPLISHED FIRST CLASS LAVATORY SMOKE DETECTOR TEST CHECK NORMAL NO FAULTS NOTED OK FOR SERVICE PER 261 400.