As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT NOT GROUNDED. L1 LAVATORY SMOKE DETECTOR CHIME AND AURAL ALERT SOUNDED MANY TIMES IN FLIGHT, NO SMOKE PRESENT. PERFORMED LAVATORY SMOKE DETECTION-SELF TEST, PER AMM TASK 26-13-00-740-801, SELF TEST PASSED. NO LAV SMOKE DETECTION HISTORY, OKAY FOR SERVICE.