I have a 751 bobcat and my hydraulic valve seems to be leaking. I took it out and put new seals in the rods and it still leaks. it is leaking out of a little hole on the bottom which I think is pressure release hole? not really sure but I don't know what to do or why it would be leaking from there. Seems to do it more after the machine has been working for awhile and the fluid gets hot which makes some sense. Is there any thing else to rebuild in it or do I need a new one?