As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD - INFLIGHT DCA-DFW. CREW REPORTED UNABLE TO PRESSURIZE CABIN. EMERGENCY DECLARED FLIGHT DIVERTED IAD LANDED WITHOUT INCIDENT. PLACARD NUMBERS ONE AND TWO AUTO PRESSURE CONTROLLERS PER MEL. FIGHT CONTINUED TO DESTINATION. REPLACED OUTFLOW VALVE ACTUATOR AND BOTH PRESSURE CONTROLLERS AT DFW ON 03/28/2013. SYSTEM GROUND CHECK NORMAL OPERATION.