As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE ALARM WENT OFF IN THE RIGHT AFT LAVATORY, NO VISUAL SMOKE OR ODOR CONFIRMATION. FLIGHT ATTENDANTS CHECKED COMPARTMENTS AND AREAS. INSPECTED THE RIGHT AFT LAVATORY AND ALL ITS COMPARTMENTS, NO EVIDENCE OF SMOKE OR FIRE. PERFORMED A SELF TEST OF THE SMOKE ALARM PER 26-14-00. ALL TESTED GOOD.