[dfluitt]

Here are the photos documenting the heater control fix. The first shot is of the panel with the knobs removed. The nut that comes loose is under the knob and holds the shaft steady. The loose nut allows the small circuit board behind it to rock back and forth when the knob is turned causing the wires to break.
The second shot shows the back of the heater control unit with the cover removed showing the main circuit board and the small circuit board (circled) on the back of the control knob.
The third shot shows the ribbon cable where it breaks off at the solder joint on the small circuit board.
The fourth shot shows the three wires I soldered in place of the ribbon cable.