Think I have correlated the leak to when the rear lift handle is pulled all the way up and my rotary cutter is attached, I think the top link or something is binding, the valve makes a noise and leaks, if I push the lever down just a bit, about 1.5 inches from the top it stops making the noise and leaking. Going to test more, with and without rotary cutter and read box blade, also going to look at how lower connects and see if that is binding.