What was found
(CAN) ON APPROACH WHEN LANDING GEAR SELECTED DOWN THE RH MAIN GEAR HAD NO INDICATION WITH THE NOSE AND LH GEAR INDICATION DOWN AND LOCKED. GEAR RECYCLED, SAME RESULT, ALTERNATE EXTENSION USED ALL GEAR DOWN AND LOCKED. RH SPRING-LOADED MAIN LANDING GEAR DOOR SELECTOR VALVE ON THE DRAG STRUT HAD A WEAK SPIRNG, OCCASIONALLY WOULD NOT PUSH THE SPOOL OUT ON THE DOOR SELECTION. REPLACED.