What was found
IAH - FLT 3712, THE CREW REPORTED THAT THE LEFT MLG HAD TROUBLE UPLOCKING. THE AIRCRAFT LANDED AT IAH WITHOUT INCIDENT WHERE MAINTENANCE REMOVED AND REPLACED THE LEFT MLG UPLOCK BOX PROX SWITCH IAW ATR42-500 MM 32-61-00, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)