As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LAVATORY SMOKE DETECTOR SOUNDED OFF ABOUT 10 TIMES WITHOUT EVIDENCE OF SMOKE OR FUMES. THE SMOKE DETECTOR WAS DE-ACTIVATED IAW SPECIAL PROCEDURES. MAINTENANCE REPLACED THE DEFECTIVE UNIT, RE-ACTIVATED THE SYSTEM AND OPS CHECKED THE UNIT. OPS CHECKS WERE GOOD AND THE AIRCRAFT WAS THEN RELEASED FOR SERVICE.