As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH AFT LAVATORY SMOKE DETECTORS ACTIVATED WHILE EN ROUTE. FLIGHT ATTENDANTS REPORTED BLUE SMOKE IN LAVS. APU WAS NOT OPERATING AND NO INDICATION OF PACK MALFUNCTIONS. ELECTRICAL SMELL WAS REPORTED. IDLE DESCENT BEGAN AT 10,000 FEET. NO POWER TO SMOKE RELATED ISSUES. FLIGHT LANDED SAFELY AT DTW. MAINTENANCE INSPECTED AFT LAVS AND CABIN OVERHEAD WITH ALL FOUND NORMAL. AIRCRAFT RETURNED TO SERVICE.