What was found
KTPA - DURING CLIMB-OUT THE CABIN CLIMBE TO 10,000 FEET AT FL 180, CLOSED CARGO HEAR OUT FLOW VALVE, NO HELP. SWITCHED TO MANUAL MODE, NO HELP. INITIATED DESCENT TO 10,000 FEET AND RETURNED TO THE RAMP. TROUBLESHOT PROBLEM TO TWO BAD WIRES ON V23 OF RIGHT FLOW CONTROL SHUTOFF AND MODULATING VALVE. PINS 1 AND 5 WERE NOT MAKING CONTACT. REPINNED C/P, RAN ENGINES 1 AND 3, PRESSURIZED A/C TO 6 PSI FLOW CONTROL SHUT OFF AND MODULATING VALVE CHECKED OK IAW MM 36-12-61. (M)