What was found
SFO - FLT 653 - DURING APPROACH INTO SFO, FLIGHT CREW REPORTED THE RT MAIN LANDING GEAR WOULD NOT EXTEND. USED ALTERNATE METHOD TO EXTEND GEAR AND GREEN LIGHT ILLUMINATED. FERRIED AIRCRAFT TO DEN. MAINTENANCE REPLACED RT MAIN LANDING GEAR DOWNLOCK ACTUATOR. PERFORMED OPERATIONAL CHECK, LEAK CHECK AND GEAR SWING, AND SYSTEM CHECKED OKAY. CYCLES: 617. (X)