I have searched the forums for a while, and all I can find are people with "ticking" noises under the hood. I have what sounds like a whinning sound that is comming from some rotating piece on the engine as it increases pitch with engine speed. I'm assuming it's from a pully bearing, but which one? I've heard many mercedes engines that make the same noise, but it's getting kinda loud. I have a 05, manual NA with 48,000 miles. Has anyone else had a similar problem? Any helpful advice?