Anyone else had a problem with the 60 gal upright air compressor switches? I got 2 on warranty but they are still crap switches. They leak air internally thus forcing the machine to come on unnecessarily & cost elec!!! I see it as a simple fix to put a generic control switch in place but those seem to lack the small tube connection that runs over to the brass fitting at the tank top location. I think it's called the "unloader valve"? Google tells me I need a new check valve at the top of the tank. Do those get dirty & stick or simply wear out?