What was found
UNABLE TO PRESSURIZE A/C AFTER TAKEOFF, RETURNED TO BASE, FOUND MAIN CARGO DOOR FULLY OPEN. FOUND VENT DOOR OUT OF RIG. AFTER RIGGING OF THE VENT DOOR AND DURING FUNCTIONAL TEST AN INTERMITTENT MAIN CARGO DOOR LIGHT WAS NOT ALLOWING THE WARNING LIGHT TO BE EXTINGUISHED WITH PARTIALLY ENGAGED LOCKING PINS. FURTHER INVESTIGATION OF THE INTERMITTENT WARNING LIGHT FOUND CONNECTOR P1-735/PIN NR 2 WORN EXCESSIVELY. REPLACED P1-735/PIN NR 2 CONNECTOR. FUNCTIONAL OPERATIONAL TEST OF CARGO DOOR AND WARNING LIGHT SYSTEM FOUND SATISFACTORY. AIRCRAFT RETURNED TO SERVICE. (M)