What was found
CREW REPORTED THAT THE RT MAIN GEAR FAILED TO RETRACT. CREW RAN QRH, DECLARED AN EMERGENCY AND WITH EMERGENCY VEHICLES ROLLING, LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT, R & R RT MLG DOWNLOCK RELASE ACTUATOR AND LANDING GEAR SELECT VALVE, PERFORMED SEVERAL GEAR SWINGS IAW AMM AND OPS CHECKED GOOD. AIRCRAFT IS GOOD FOR SERVICE.