I expect a 2000 M roadster to develop some problems, but this one seems unique. My rear view mirror looks like some fluid has run out of it and there is a distinct (wavy) line separating the top half from the bottom: the bottom half is now quite dark and the top is light. You can still see a reflection out the back, but it is very annoying. I suspect it is somehow related to the brightness control that becomes active at night. Has anyone heard of this before? Is there a fix, or if there is none can someone suggest a source where I can get a good used replacement rear view mirror? Thanks for any help!