As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED SEVERAL LOUD BANGS FOLLOWED BY THE LOSS OF CABIN PRESSURIZATION AND FORWARD EQUIPMENT OVERHEAT INDICATION. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND OVERBOARD EXHAUST VALVE PARTIALLY OPENED AND THE SURROUNDING DUCT WORK COLLAPSED. REPLACED OVERBOARD EXHAUST VALVE AND EXHAUST DUCT WORK. SYSTEM GROUND CHECK NORMAL OPERATION.