My 04 TB was making a strange noise when I turned the engine off; a whining or winding noise similar to a jet engine shutting down is the best I can describe it. My mechanic said the bearing in the AIR pump was bad and the pump needed to be replaced. Despite a hefty bill, replacing the pump didn't correct the noise although it doesn't make this noise all the time (wouldn't you know it didn't to it when I took it to the shop). Also, since the AIR pump was replaced, I've been having issues with my battery draining down. Any suggestions on what might be causing the noise and what could be wrong with the battery would be greatly appreciated.