As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT LAVATORY SMOKE DETECTOR ALARM SOUNDED IN FLT. INSPECTED AND FOUND TO BE A FALSE ALARM. INSPECTED LT LAVATORY SMOKE DETECTED AND FOUND NO DEFECTS. OPS CHECKED AND TESTED IAW CMM 26-10-02, PG 504. OPS CHECK COULD NOT DUPLICATE FALSE ALARM.