I have a 2003 CL55 AMG and have a loud whining or solid beep even when engine is off. It seems to be coming from the area just in front of the drivers door near the fuse box under the hood. It is loud enough you can hear it outside the garage with the doors closed. It will do it for hours then start again on its own. I am guessing it has to be electrical but have no idea what it is. Anyone have any ideas? Thanks in advance