As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 7681 - LAX TO LAX - FLIGHT CREW REPORTED LAV SMOKE DETECTOR INDICATION IN FLIGHT. FLIGHT CREW DID NOT REPORT EMERGENCY AND RETURNED TO BLOCK WITHOUT INCIDENT. MX PERSONNEL REMOVED AND REPLACED LAV SMOKE DETECTOR OPERATIONALLY CHECKED SATISFACTORY. A/C WAS RELEASED TO RETURN FOR SERVICE.