Dennis, I had the same issue w/one of mine. Mica's response was:
I don't have an exact record of the date, but the side dots have been inlaid aluminum for at least 12 years. Prior to that (and still on special request) they were bronze. Since the edge of the fingerboard is not finished, you can use either a fine sandpaper or the extrafine sctochbrite and remove the surface tarnish. Then a drop of lemon oil on the edge of the fingerboard will restore the Ebony's dark color.