What was found
IAH - FLIGHT 2597, THE CREW REPORTED THAT THE RIGHT MAIN LANDING GEAR DID NOT LOCK IN THE UP POSITION. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE RIGHT MAIN LANDING GEAR UPLOCK BOX, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.