As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED UNABLE TO PRESSURIZE CABIN WITH LOTS OF AIR NOISE FROM ALL DOORS. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND PRESSURE CONTROLLER NUMBER 2 FAULTING ACTUATOR. REPLACED ACTUATOR. SYSTEM GROUND CHECK NORMAL OPERATION (CLOSED).