As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAVATORY SMOKE DETECTOR ACTIVATED IN-FLIGHT. NO EVIDENCE OF FIRE OR SMOKE. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND NO EVIDENCE OF SMOKE OR FIRE. REPLACED LAVATORY SMOKE DETECTOR, OPERATIONAL CHECKS GOOD.