As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED AT 31,000 FEET RED CABIN ALTITUDE LIGHT ILLUMINATED AND WARNING HORN WENT OFF. ACCOMPLISHED EMERGENCY DESCENT. EMERGENCY DECLARED FLIGHT LANDED DFW WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED NUMBER ONE AND TWO PRESSURE CONTROLLERS. SYSTEM GROUND CHECK NORMAL OPERATION.