On my wife's '04 Tahoe, we started smelling oil burning. Very slow leak, but could never find it until today. Appears to be coming from around the engine oil pressure sensor at the back of the engine. Anyone have this problem and how do you get to it to fix it?? I can barely get my hands back there and have to use a small mechanic's mirror (which I ended up breaking, lol) to see it. Help greatly appreciated.