As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ILM/GRR - FLT 1612 - EN ROUTE TO GRR, BOTH AUTOMATIC PRESSURIZATION SYSTEMS WENT OFF LINE. MANUAL SYSTEM WORKED OK. FLIGHT DIVERTED TO PIT TO ACCOMMODATE MAINTENANCE. FLIGHT LANDED IN PIT WITHOUT FURTHER INCIDENT. MAINTENANCE ADJUSTED LEFT AND RIGHT PRESSURE REGULATING SHUT OFF VALVES, P/N 107416, AND REPLACED RIGHT PACK FLOW CONTROL VALVE AND LEFT RATE OF CHANGE VALVE. (X)