I have a 763 with a little over 800 hours. What appears to be a control valve (if it was a car it would be the passenger side) has what looks like the control vavle mounted on the side wall of the machine. It has solenoids in the top of it and has hysraulic lines (steel and rubber) running to it. The side of the vavle facing the motor there is a rubber boot over a knob of some type that would be the first knob going down that side it appears the leak is coming out the rubber boot or cover. There is another knob that sticks out a little further and then a rubber hose with steel fitting under that. I changed that rubber hose thinking that was it. Well it wasnt it. Those knobs are leaking and is where the fluid is coming from. Is this repairable and do I have to pull the vavle what exactly is it that is leaking?