As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 1543 - EN ROUTE TO MSP FROM CLT AT FL310, THE CABIN PRESSURE ALTITUDE CLIMBED OVER 10,000 FEET. CREW PERFORMED AN EMERGENCY DESCENT. DURING DESCENT THE MANUAL PRESSURIZATION OPERATED INTERMITTENTLY. THE FLIGHT DIVERTED TO ORD AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE AIRCRAFT SAFE FOR A FERRY FLIGHT TO PIT. AT PIT, MAINTENANCE REPLACED BOTH CABIN PRESSURE CONTROLLERS. (M)