As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: 3L LAVATORY SMOKE DETECTOR BRIEFLY ALARMED IN CRUISE; ONE PERSON EXITED THE LAVATORY, BUT NO SMOKE WAS DETECTED. ACCOMPLISHED OPERATIONAL CHECK OF 3L LAVATORY SMOKE DETECTOR IAW AMM 26-13-00, NO ISSUES NOTED.