Hey Dave, this is what was happening to mine, and of course when I took it for service, the sound didn't happen! Do you have LPG? They moved something to do with the LPG in the engine bay but the sound still happens, but it seems to be louder on hot days and in the mornings. And only if I have the window open and try hard to listen, very weird. They claim nothing is wrong so I don't know what to think, still sounds like the belts to me.
"If this were a dictatorship, it would be a heck of a lot easier -- just so long as I'm the dictator." -- George W. Bush (December 18, 2000)