As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 5752 - IN FLIGHT, THE CREW RECEIVED A LAVATORY SMOKE DETECTOR MESSAGE ON THE EICAS. THE AIRCRAFT RETURNED TO THE FIELD AND UPON LANDING THE INDICATION CLEARED. THE FIRE DEPARTMENT INSPECTED THE LAVATORY AND FOUND NO PROBLEMS. THE SMOKE DETECTOR WAS RETESTED AND FOUND TO BE IN WORKING ORDER. NO FURTHER ACTION WAS TAKEN. (M)