As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - INFLIGHT T1096/01 LOST PRESSURIZATION AT 31,000 FEET. PERFORMED EMERGENCY DESCENT. RETURNED TO DFW. REPLACED BOTH NUMBER 1 AND NUMBER 2 PRESSURE CONTROLLERS. ACCOMPLISHED COMPLETE SYSTEM TESTS PER MAINTENANCE MANUAL. SYSTEM GROUND CHECKED NORMAL OPERATION.