As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: AFT RIGHT LAVATORY SMOKE DETECTOR ACTIVATED WITH NO ASSOCIATED SMOKE. MAINTENANCE ACCOMPLISHED OPERATIONAL TEST OF RIGHT AFT LAVATORY SMOKE DETECTOR PER AMM 26-14-00. NO FAULTS NOTED AND PERFORMED SATISFACTORY OPERATIONAL CHECK.