Hi Bruce,
Yes the compressor was turning freely, Curt also checked it. I also checked the rods for looseness when I had the crankcase cover off to replace the leaking gasket, they are tight. When I cleaned the compressor I found a rebuild tag. I have no idea what the average life of a compressor is, but I suspect the PO put on a rebuilt one when he put the new engine in about 99,000 miles ago. My air system now has few leaks so the compressor goes about 20 minutes before the pressure drops to 90 PSI and has to work again. Oftener in traffic with a lot of braking.
Thanks, Sam