[martin417]

It sounds like you might have a bad seal in your cylinder. The EA and EB parts are the exhaust ports for the valve. When you shift the valve, pressure is applied to the B port, and the A port is open to atmosphere. If air leaks across the piston seal, it will escape out the exhaust port.When you have a leaky piston seal, it usually leaks in both directions (air will seep out in either position) but there are conditions that will cause a cylinder to leak in only one direction. Try removing the cylinder from the equation (plug bot A and B ports). if you still have leaks, it's the valve, if not, it's the cylinder.

Martin