What was found
ON FLIGHT 4370, CREW REPORTED LANDING GEAR DID NOT RETRACT AFTER TAKEOFF WITH ASSOCIATED AIR GROUND CAUTION MESSAGE ON EICAS. AIRCRAFT REMOVED FROM SERVICE. PERFORMED GVI AND CONTINUITY TEST OF THE NLG WOW PROX SWITCH HARNESS FROM PIN C TO HARNESS SHIELDING AND VOLTAGE READINGS. CONTINUITY AND VOLTAGE READINGS NORMAL. NO DEFECTS NOTED. PERFORMED OPERATIONAL CHECK OF AIR/GROUND SYSTEM IAW AE MTX WC NR 32-700-16. OPERATIONAL CHECK GOOD. NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.