OK, let me see if I can help. I have an 07 Discovery with a full wall Power Gear electric slide. My slide has three motors #1(front) #2(center) #3(rear).
The controller is located under the bed. My stop points are set by two buttons, one marked in & one marked out.
I find it hard to believe that your being told nothing more can be done.
Can you give me an exact model? Should be a part number on that controller.
Thanks