> Replacing it is very simple. There is a single screw at the top corner
> of the assembly (between the headlight and the marker light) that
> secures the marker light to the headlight. Easy access from above when

I should say the screw secures the marker light to the headlight
housing, not the actual headlight. The screw in question is number 31 in
the drawing at http://tinyurl.com/2j2d4