HELP - Rollei P66S Projector

I need help trying to solve a auto focus problem with a Rollei P66S
projector for 6x6 slides.

The projector auto focus function does not stop when the image is in
focus. It keeps moving the lens until the lens is pushed out of the
projector. The focus motor continuosly runs like it is trying to focus
the slide. Even if the focus is set manually to a sharp focus using the
remote the autofocus problem resumes. It doesn't recognize that the
slide is in focus.

I am thinking that perhaps the mirror and sensors are out of alignment
and need some slight adjustment. Does anyone have any idea how to
troubleshoot the autofocus system? Who might be able to help with this
sort of problem?

Thanks for any help...............

John