As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FL 28 - ON APPROACH, AFTER GEAR SELECTED DOWN, CREW RECEIVED THE EICAS MESSAGES 'GEAR DISAGREE' AND 'GEAR DOOR'. CREW ACCOMPLISHED ALTERNATE LANDING GEAR EXTENSION PROCEDURE. FLIGHT LANDED WITH NO FURTHER INCIDENT. MAINTENANCE REPLACED THE MAIN LANDING GEAR CONTROL VALVE. (M)