As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DTW - CREW REPORTED BOTH PACKS FAILED ON DESCENT AND CABIN PRESSURE STARTED TO CLIMB. CAPTAIN INITIATED EMERGENCY DESCENT TO 8000 FEET. NO MASKS DEPLOYED. EMERGENCY DECLARED FLIGHT LANDED DTW WITHOUT INCIDENT. CLEANED FLIGHT DECK AND CABIN TEMP SENSOR. SYSTEM GROUND CHECK NORMAL OPERATION.