[Huney1]

An old Indian trick: When I'm confused about a noise source I take a long screwdriver and put the handle to my ear then put the end on the compressor, or whatever, and usually hear it in spades. Be careful and don't put it on anything moving like the belt. You can probably trade the compressor in for a core credit, but don't run it 'til it tears up 'cause it won't be worth a plug nickel.