What was found
DURING DEPARTURE, LANDING GEAR WOULD NOT RETRACT WITH SYS 1 POSITION DETECTION, SWITCHED TO SYSTEM 2 POSITION DETECTION, STILL WOULD NOT RETRACT, CYCLED SYS 1 AND SYS 2 SEVERAL TIMES, ON FINAL ATTEMPT WITH SYS 2 GEAR RETRACTED. BITE CHECKED PROXIMITY PROCESSING UNIT IAW TSM 32-61-00, FOUND FAULT CODE 63 DISPLAYED WITH BOX LIGHT ILLUMINATED RED. R & R THE PROXIMITY ELECTRONIC UNIT IAW AMM 32-31-71-04. OPS CHECKED GOOD. ACFT OK FOR SERVICE.