As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. RIGHT AFT LAVATORY SMOKE DETECTOR ACTIVATED IN FLIGHT, BUT WHEN FLIGHT ATTENDANT OPENED DOOR, NO SMOKE OR FIRE OBSERVED. ACCOMPLISHED OPERATIONAL TEST OF THE RIGHT AFT LAVATORY SMOKE DETECTOR WITH NO FAULTS NOTED.