As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CAPTAIN REPORTED UNABLE TO CONTROL CABIN PRESSURIZATION DURING FLIGHT. ALL CABIN 02 MASKS DEPLOYED SUCCESSFULLY. EMERGENCY DECLARED LANDED DFW WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED BOTH AUTO CABIN CONTROLLERS. SYSTEM, GROUND CHECK NORMAL OPERATION.