What was found
PDIS 298 21-30 4361 1SEP20 MEM. NO PRESSURIZATION ON TAKEOFF MODE SELECTORS 1 OR 2 WOULD NOT WORK, USED MANUAL MODE REMAINDER OF FLIGHT, STAYED 20,000 AND BELOW. FACT 11SEP20 21:14 MEM, REF AMM 21-31-00-5 AND FIM 21-31 FAULT TREE 803. PERFORMED BITE TEST ON NR 1 & NR 2 CABIN AUTO CABIN PRESSURE CONTROLLERS. FOUND BOTH CONTROLLERS WITH AC MOTOR FAULTS, REF WDM 21-31-11, 21-31-21 & 21-31-31. INSPECTED ELECTRICAL CONNECTORS ON CABIN PRESSURE OUTFLOW VALVE ACTUATOR, FOUND CONNECTOR D704 DISCONNECTED. INSPECTED, CLEANED, AND RE-CONNECTED CONNECTOR. PERFORMED NEW TEST OF NR 1 & NR 2 AUTO PRESSURE CONTROLLERS. THIS TIME FOUND NO FAULTS WITH EITHER CONTROLLER. PERFORMED NUMEROUS SATISFACTORY TESTS OF CABIN AUTO PRESSURE CONTROL SYSTEMS 1 & 2, IAW AMM 21-31-00-5. ALSO OBSERVED OUTFLOW VALVE FREELY MOVING AS COMMANDED. AIRCRAFT OK FOR SERVICE.