My Mustang 2076 right hand joystick control needs replacing. I can't lock the auxiliary hydraulics on. I have to hold the little yellow switch the whole time when using it. Mustang gets over $900 for a new one. Used ones are over $800. Does anyone have an electrical schematic for one, or know where I could download one? I want to rewire the aux. hyd. valve with some toggle switches if possible. Is it possible?