As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TUL - FLT 9186 - DURING FUNCTIONAL AT FL 370 - AMBER SAFETY VALVE INDICATED OPEN AND CABIN ALTITUDE BEGAN TO CLIMB. NR 1 PRESSURE REGULATOR FAULTED. MANUALLY SWITCHED TO NR 2 REGULATOR AND REGAINED CONTROL OF CABIN PRESSURIZATION. ACCOMPLISHED EMERGENCY DESCENT AND AIRCRAFT LANDED TUL WITHOUT INCIDENT. REPLACED NR 2 SAFETY RELIEF VALVE. REPLACED NR 1 AND NR 2 CABIN PRESSURIZATION CONTROLLERS. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)