Hi All, I've got a Wolf Sioux 50, 2.5HP, 9.5CFM, 230V, MWP: 116psi, 50 Litre Air Compressor. It has two valves/pipes where you can plug in air accessories to the compressor (sorry if that's not the correct term). One of the valves has just stopped working. If I plug in an spray gun for example, there's no air coming out at all. The other one works fine. Any ideas what this could be?