One of my power side mirrors (900S, 1992) is having a slight problem: it works
fine moving left, right, or down, but it won't tilt up. It makes a noise like
it's trying to though. I'm guessing that something probably just needs to be
lubricated in there, but I'm not sure how to get into the mirror housing to
investigate. Bentley doesn't seem to cover the power mirrors for some reason.