What was found
IAH - FLIGHT 2622, THE CREW REPORTED A LANDING GEAR AIR/GRND SYSTEM FAILURE AND THAT THE GEAR HANDLE WOULD NOT COME UP. AFTER LANDING AT IAH WITHOUT INCIDENT RECEIVED A "WOW" INOP MESSAGE. MAINTENANCE REMOVED AND REPLACED THE NLG WOW PROXIMITY SWITCH AND ASSOCIATED CONNECTOR, SERVICED THE NLG AS A PRECAUTION, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.