As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MDW-SRQ - FLT 563 - DURING CLIMB, AIRCRAFT PRESSURIZATION CANNOT BE HELD WITH SINGLE PACK OPERATION WITH CARGO HEAT OUTFLOW VALVE CLOSED. AIRCRAFT WAS DIVERTED TO INDIANAPOLIS, INDIANA. REMOVED AND REPLACED THE HEAT EXCHANGERS, THE FLOW MULTIPLIER AND SHUT-OF VALVE, AND THE WATER SEPARATOR BAGS. CABIN DECAY TESTED AND THE APU/ECS CONDITION MONITORING C/W PER BOELING MM.