What was found
MIA - INFLIGHT T2177/22 - AFTER TAKEOFF, THE NUMBER TWO AIR DATA COMPUTER FAULTED. LANDING GEAR WOULD NOT RETRACT IN POSITION NUMBER TWO. NUMBER TWO AIR DATA COMPUTER FAILURE. AUTOTHROTTLE FAILURE AND CABIN PRESSURE REGULATOR NUMBER TWO FAULT. ACCOMPLISHED BITE ON PROXIMITY DETECTOR PROCESSING UNIT AND FOUND FAULT AND BOX LIGHTS ON WITH FAULT CODES 04, 30 AND 31. REPLACED PROXIMITY DETECTOR PROCESSING UNIT. PROXIMITY BITE THEN SHOWED NOSE WHEEL CENTERED SENSOR FAULT. REPLACED SENSOR 82GB. SYSTEM GROUND CHECKED NORMAL OPERATION.