As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YKM - FLIGHT 2002 - LAVATORY SMOKE DETECTOR WENT OFF WITH NO SMOKE DETECTED. MAINTENANCE PLACED THE SYSTEM ON MEL 26-4. AIRCRAFT RETURNED TO SERVICE. CLEARED BY REPLACING THE SMOKE DETECTOR. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.