What was found
IAH - FLIGHT 2317, THE CREW REPORTED A LANDING GEAR AIR/GROUND FAILURE MESSAGE ON EICAS DURING FLIGHT. THE AIRCRAFT LANDED IN IAH WITHOUT INCIDENT WHERE MAINTENANCE REMOVED AND REPLACED THE LEFT HAND MAIN LANDING GEAR DOWNLOCK PROXIMITY SWITCH, OPERATIONALLY CHECKED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.