What was found
LANDING GEAR LEVER DISAGREE. NOSE GEAR DID NOT RETRACT AFTER TAKEOFF, BUT HANDLE WAS UP AND MAIN GEAR SHOWED UP AND LOCKED. RECYCLED GEAR PER QRH, AND CONTINUED WITH FLIGHT. LANDED UNEVENTFULLY IN EWR. REMOVED AND REPLACED UPLOCK BOX. PERFORMED WIRING CHECKS OF WIRING OF NOSE GEAR PROXIMITY SWITCHES NR 1. REMOVED AND REPLACED LGEU, PREVIOUS PARTS DID NOT SOLVE PROBLEM. REMOVED AND REPLACED WIRING HARNESSES W014 SWUNG LANDING GEAR OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.