As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MTY - CREW REPORTED UNABLE TO PRESSURIZE AIRCRAFT. EMERGENCY DECLARED FLIGHT RETURNED MTY LANDED WITHOUT INCIDENT. BOTH CABIN AUTO PRESSURE CONTROLLERS PLACARD PER MEL 21-32-03-2. FLIGHT CONTINUED TO DESTINATION. REPLACED BOTH CABIN CONTROLLERS AT DFW ON 02/09/2012. SYSTEM GROUND CHECK NORMAL OPERATION.