What was found
PDIS: RCVD CABIN RATE ON DEPARTURE. A/C WOULD NOT PRESSURIZE. CHANGED CONTROLLER TO MANUAL NO CHANGE. OUTFLOW VALVE INDICATED CLOSED ENTIRE TIME ON SYNOPTIC PAGE AND ON PNL. ON SYNOPTIC "CLOSED" INDICATOR IN AMBER BUT VALVE INDICATOR WAS CLOSED. RETURNED TO MEM. FOUND HARDWARE MISSING IN CENTER CARGO DOOR VENT DOOR LINKAGE. REPLACED HARDWARE IAW MD-10-30 SMP. OPS CHECKED DOOR IAW MD-10-30 MM 52-32-00-5. PRESSURIZED A/C PER MD-10-30 MM 21-00-00-5 CHECKED GOOD.