What was found
MEM - FLT 1460 - EN ROUTE DFW-GSO, UNABLE TO CONTROL CABIN PRESSURIZATION IN AUTO OR MANUAL MODE. EMERGENCY DESCENT ACCOMPLISHED TO 10,000 FT. AIRCRAFT DIVERTED TO MEM AND LANDED WITHOUT INCIDENT. AIRCRAFT FERRIED TO DFW. REPLACED PRECONDITIONED AIR CHECK VALVE. ALSO, REPLACED PRESSURIZATION CONTROL PANEL. SYSTEM GROUND CHECKED NORMAL OPERATION. FUNCTIONAL CHECK FLIGHT ACCOMPLISHED WITH SATISFACTORY OPERATION NOTED. (M)