Here is a close up picture of the connector after the circuit board has been removed.
Here is a view of the flip side of the circuit board.
Here is where I found my problem. One of the solder connections to the ribbon pin connector had cracked. I could only see this with magnification, I could not see it with my 40+ year old eyes alone. Resolder this pin with a low wattage soldering iron.
Then put it all back together. It took me a total of about 2 hours for the procedure. I could do it in less than half the time if I had to do it again. Much of that time was spent on going over the circuit board with the magnifying glass, plus I took the clear plastic lense off to clean some dust and debris from inside the instrument panel.
I hope this helps some of the other members who have had the same problem.
Greg Upton
Houston, TX