As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED HAD RAPID DEPRESSURIZATION WHILE IN AUTO. SWITCHED TO MANUAL CONTROL AND WAS ABLE TO CONTROL. NO FLOW LIGHTS ILLUMINATED. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED NUMBER 1 CABIN PRESSURE CONTROLLER AND SELECTOR. SYSTEM GROUND CHECK NORMAL OPERATION.