What was found
THE RT MLG WOULD NOT RETRACT WHEN GEAR HANDLE WAS PLACED IN THE UP POSITION AFTER TAKEOFF. THE SECOND OFFICER'S ANNUNCIATOR PANEL INDICATED THAT THE RIGHT GEAR DOOR WAS DOWN. A VISUAL CHECK CONFIRMED THE GEAR WAS DOWN. THE AIRCRAFT WAS RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE RT GEAR DOOR ACTUATOR AT FAULT. THE RT GEAR DOOR ACTUATOR WAS REMOVED AND REPLACED IAW MM 32-32-01. A GEAR RETRACTION WAS PERFORMED AND ALL OPERATION AND INDICATIONS CHECKED GOOD.