Well she's purring like a kitten again and you guys were spot-on. I planned to take off the belt and try spinning all the pulleys, check belt condition, pull the tensioner back and forth to see if it felt loose, etc. But when I went to release the tensioner to take the belt off, some plastic bits snapped off the tensioner and shot into my face. So it was a pretty easy call to replace the tensioner, the local dealer actually had the part, I convinced them not to charge me the $85 list price since I could get it for $61 online, and I was back in business under 2 hours.
For the record it takes a T40 torx socket to get the tensioner off, and I was able to get at it without removing anything else (except the belt of course).
Thanks for your helps.
