As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE TOILET CAU MSG IN FLT NO FIRE OR SMOKE PRESET IN LAV CAU PERSISTED C/W QRH MSG PERSITED UNTIL LANDING. NO ONE IN LAV WHEN MSG APPEARED. NO OVERWEIGHT LDG. AIRCRAFT REMOVED FROM SERVICE. R/R LAV SMOKE DETECTOR PER AMM 26-16-01 OPS CHECK GOOD AT THIS TIME