As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT LOST CABIN PRESSURIZATION DURING CRUISE AT 31,000 FEET. CREW FOLLOWED COM PROCEDURE AND EMERGENCY DESCENDED TO 10,000 FEET. CABIN CLIMBED 700-800 FPM WITH THROTTLES AT IDLE. CONTINUED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND WATER SEPARATOR CANISTER SEPARATED. REPLACED THE LEFT WATER SEPARATOR. AIRCRAFT RETURNED TO SERVICE.