As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT RIGHT LAVATORY SMOKE ALARM ACTIVATED DURING FLIGHT. FLIGHT ATTENDANTS INVESTIGATED AND FOUND NO SMOKE OR FIRE. RESET THE SMOKE ALARM AND SHUT OFF. MAINTENANCE PERFORMED A LAVATORY SMOKE DETECT TEST IAW MM 26-14-00, NO FAULTS NOTED.