I think at this point I am going to put the cover back on with the new parts and see if the three things I found bad actually fix the problem, i.e the plugged bypass orifice, the barrel off the end of the screen that was lodged in the supply port, and the leaking supply line to the clutch valve.
I am not really sure I have an interior valve body leak and was asking if you have any knowledge of what happens when you pressurize the system with compressed air. I think that the tolerances in the spools are such that they are probably not air tight anyway. It was the air leaking by these that I had mentioned was leaking.
I will post the results when I get it back together and see what happens. Thanks again for your input.