As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3533 DURING THE CLIMB GOT THE CREW RECEIVED AN AUTO PRESSURIZATION FAIL MESSAGE AND FAILED WHILE PERFORMING THE AIRCRAFT PROCEDURES MANUAL FOR PRESSURIZATION. THE CREW DECLARED AN EMERGENCY AND RETURNED TO DFW WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE OUT FLOW VALVE IAW CRJJ 700 MM 01-22-01. THE OPERATIONAL CHECK WAS GOOD IAW AMM 21-22-01. THE AIRCRAFT WAS RETURNED TO SERVICE.