What was found
REF 315380/3,4 & 314381/1 ON APPROACH AFTER SELECTING GEAR HANDLE DOWN, RECEIVED NOSE DOOR OPEN, & GEAR DISAGREE WARNING MESSAGES AFTER APPROXIMATELY 15 SECONDS AFTER SELECTING GEAR HANDLE DOWN. LEFT & RIGHT GEAR SHOWED DOWN, NOSE GEAR SHOWED UP. RAN QRH & USED MANUAL EXTENSION RELEASE HANDLE. GEAR DISAGREE MESSAGE CLEARED AND ALL 3 GEAR SHOWED DOWN & LOCKED. RECEIVED HYD 3 HI-TEMP MSG ON GROUND. LANDING GEAR MANUAL RELEASE HANDLE IS STILL PULLED.