As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LIT - CREW REPORTED PRESSURIZATION FAULT. EMERGENCY DECLARED FLIGHT LANDED LIT WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. PLACARD BOTH CABIN AUTO PRESSURE CONTROLLERS PER MEL 21-23B. REPLACED NUMBER 1 PRESSURE CONTROLLER AT DFW ON 05/07/2012. SYSTEM GROUND CHECK NORMAL OPERATION.