As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DTW - FL 988 - DURING CLIMB-OUT THE LAVATORY SMOKE DETECTORS WENT OFF AND THERE WAS A MIST IN THE CABIN. THE AIRCRAFT RETURNED TO THE FIELD. THE CABIN CLEARED WHEN THE AIRCRAFT WAS ON THE GROUND. MAINTENANCE RAN THE ENGINES AND COULD NOT DUPLICATE. REPLACED BOTH WATER SEPARATOR BAGS AND PROGRAMMED THE LEFT BYPASS VALVE AS PRECAUTIONARY. (M)