As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE ALARM IN LAVATORY SOUNDED CONTINUOUSLY. STOPPED WHEN AIRSTAIR DOOR OPEN. INSPECTED LAV SMOKE DETECTOR. NO DEFECTS NOTED. CLOSED CABIN DOOR AND RAN APU WITH BLEED AIR ON.NO DEFECTS. RAN BOTH ENGINES BLEED AIR ON. NO DEFECTS. NO SMOKE OR ODOR PRESENT. LAV LIGHTS NO DEFECTS. OKAY FOR SERVICE. APU BLEED PLACED ON MEL AS PRECAUTION.