What was found
**SDR FILED OPEN** GEAR DISAGREE EICAS MESSAGE WHEN GEAR LOWERED ON APPROACH. ACCOMPANIED BY LDG GEAR MONITOR STATUS MESSAGE. QRH PROCEDURE RAN IN ENTIRETY VERIFIED VALVE INPUT ARM ON LANDING GEAR SELECTOR VALVE INSTALLED PROPERLY PER AMM 32-31-02. <BR>CAPPED MAIN CARGO DOOR SHUTOFF VALVE, PSI REMAINED AT 1900. RETURNED TO NORMAL CONFIGURATION PER AMM 52-32-09.<BR>DISCONNECTED AND CAPPED LANDING GEAR SELECTOR VALVE LEFT HYD GEAR DOWN LINE, HYD PRESSURE READING 2900PSI WITH GEAR LEVEL IN THE DOWN POSTION. RECONNECTED LINE PER AMM 32-31-02. FURTHER TROUBLESHOOTING REQUIRED.