What was found
IAH - FLT 3724 - PILOT REPORTED, THAT AFTER THE GEAR WAS SELECTED TO RETRACT THE RIGHT GEAR EMITTED A LOUD NOISE, AND THE RIGHT GEAR UNLOCK LIGHT REMAINED ILLUMINATED. THE AIRCRAFT LANDED AT IAH WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE RIGHT MAIN GEAR PROXIMITY SWITCHES, OPERATIONALLY CHECKED THE GEAR, AND RETURNED THE AIRCRAFT TO SERVICE. (M)