So I got a second opinion from a mechanic, and he thinks it's the idler pulley just under the SC pulley that is making the whine/ wheezing noise. The bolt on that pulley was vibrating and heating up much more than any of the others. I'd like to release the tension on the belts and change the pulley myself. Anyone know of a good spot to buy one? Also how involved is releasing the belt tension and working on the pulley system...