As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - AIRCRAFT COULD NOT CONTROL PRESSURIZATION. EMERGENCY DECLARED, RETURNED DFW WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED TEMPERATURE CONTROL VALVE AND COMPRESSOR OUTLET TEMPERATURE SENSOR VALVE. FOUND RIGHT AIR CONDITIONER PACK RE-HEATER CRACKED. REPLACED RE-HEATER ASSEMBLY HEAT EXCHANGER. SYSTEM GROUND CHECK NORMAL OPERATION.