What was found
DURING NORMAL GEAR EXTENSION, THE RIGHT MAIN GEAR ON SYS 1 AND 2, INDICATOR SHOWED RED UNLOCKED WITH THE AMBER DOOR LIGHT ILLUMINATED. SYSTEM 3 SHOWED NO LIGHT FOR RIGHT MAIN DOWN INDICATOR. THE GEAR WAS LOWERED WITH THE MANUAL GEAR EXTENSION AND ALL 3 GEAR SHOWED DOWN AND LOCKED. USING TSM 32-30-00, FIGURE 115, REMOVED AND INSTALLED THE RT MAIN GEAR SEQUENCE VALVE.