What was found
GEAR WOULD NOT RETRACT AFTER TAKEOFF IN EITHER SYSTEM. PERFORMED BITE TEST OF PROX DETECT UNIT 54GB. NO MEMORIZED FAULTS. PERFORMED SYS TEST WITH THE FOLLOWING SENSOR FAULTS, 03 (LT BOGIE SYS 1), 04 (RT BOGIE SYS 1), 05 (NOSE CENTERED SYS 1), 06 (LT MLG SHOCK SYS 1), 07 (RT MLG SHOCK SYS 1), 10 (LT BEAM SYS 2), 11 (RT BEAM SYS 2), 12 (NOSE CENTERED SYS 2), 13 (LT MLG SHOCK SYS 2), 14 (RT MLG SHOCK SYS 2). ONLY THING IN COMMON IS PROX BOX. SUSPECT BAD PART FROM STOCK REF WRI 32-60/7307. REMOVED AND REPLACED PROX DETECT CONTROL UNIT 54GB. PERFORMED SYSTEM TEST OF PROX BOX PER SAME. ALL PREVIOUS SENSOR FAULTS HAVE NOW CLEARED AND SYSTEM TEST GOOD. OK FOR CONTINUED SERVICE.