As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. LAVATORY SMOKE DETECTOR WARNING INDICATION LASTING 25 SECONDS. SEVERAL HOURS LATER, SAME WARNING LASTING 7 SECONDS. NO EVIDENCE OF SMOKE. ACCOMPLISHED SMOKE DETECTOR INSPECTION AND SYSTEM TEST IAW TSM 26-17-00 WITH NO FAULTS. OPERATIONAL CHECK GOOD.