What was found
(CAN) UPON L/G DOWN SELECTION ON ARRIVAL, THE RT MLG DID NOT EXTEND. QRH PROCEDURE CARRIED OUT & RT MLG STILL REMAINED IN THE UP POSITION. ALTERNATE GEAR EXTENSION CARRIED & RT MAIN REMAINED IN THE UP POSITION. PUT ACFT BACK IN NORMAL CONFIGURATION & RESELECTED GEAR UP & THEN BACK DOWN. GEAR EXTENDED NORMALLY. 3 GREEN, LG ALSO VISUALLY CONFIRMED DOWN. ALSO 3 GREEN ON ALTERNATE IND. R & R RT MLG UPLOCK ACTUATOR WITH NEW FUNCTION CHECKED DURING GEAR SWINGS AND LEAK CHECKED WITH NO FAULTS FOUND. HYD SYSTEM BLEED, ABOVE MENTIONED TASKS COMPLETED IAW AMM 32-30-27, PN 11300-105, SN DCL190193, BN 1439425 INSTALLED WO 333097 COMPLETED.