As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. IN FLIGHT OVERHEAD LAVATORY SMOKE ANNUNCIATOR LIGHT ILLUMINATED. AFT LAVATORY NO SMOKE OR FUMES NOTED BY FLIGHT ATTENDANTS AFTER PASSENGER EMERGED FROM USE. ACCOMPLISHED LAVATORY SMOKE DETECTOR TEST, PER AMM 26-14-00. OPERATIONS CHECKS NORMAL.