As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT LAVATORY SMOKE DETECTOR ANNOUNCES IN FLIGHT. *S/D* CHECK OF THE DETECTOR FOUND THAT THE TEST SWITCH HAD BEEN DAMAGED (NO DETENT) AND COULD VIBRATE TO THE ''TEST'' POSITION AND SOUND THE ALARM. A SERVICEABLE DETECTOR WAS INSTALLED IN THE AIRCRAFT AND OPERATION HAS BEEN NORMAL TO DATE.