Len, I just took the picture of your controller and brought into Irfanview. I rotated it 180 and zoomed in on it to try to see more of the pieces and parts. To me, the solder joints on the potentiometer don't look good. Is there a possibility that there might be a "cold" joint on the red wire? It just doesn't look good to me. It should be a smooth shiny flow of solder and from what I can see in the pic, it doesn't look that way. I'd sure like to see the underside of that board too.