What was found
AFTER TAKEOFF, THE PILOT REPORTED THE CABIN PRESSURE SYSTEM 1 & 2 FAULTED. NR 1 ENGINE COMPRESSOR VANE DUE TO THAT SITUATION THE AIRCRAFT RETURNED TO DEPARTURE FOR MAINTENANCE. MAINTENANCE PERFORMED FAULT ANALYSIS IAW TSM 21-31-00-810-807-A, REPLACED THE OUTFLOW VALVE IAW AMM 21-31-51, PB401. PERFORMED A TEST WITH NORMAL RESULTS. PERFORMED FAULT ANALYSIS IAW TSM 75-30-00-810-847-A, REPLACED THE LOW PRESSURE COMPRESSOR BLEED MASTER ACTUATOR IAW AMM 75-31-42, PB401. PERFORMED ENGINE IDLE LEAK CHECK AND POWER ASSURANCE TEST WITH NORMAL RESULT. AIRCRAFT RETURNED TO SERVICE