What was found
IAH - FLIGHT 2106, THE CREW REPORTED A LOUD BANGING NOISE UNDER THE FLIGHT COMPARTMENT FLOOR, AND THAT THE RIGHT MAIN LANDING GEAR INDICATION CYCLING BETWEEN UP AND AMBER. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE RIGHT MAIN LANDING GEAR UPLOCK BOX, OPERATIONALLY CHECKED WITH NO DEFECTS NOTED, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.