Thanks for your help. I figured the control board could not be replaced.
Two items of feedback:
1. The Accept Answer button is not green, but the instructions say to click the green ACCEPT icon.
2. The weblink you put in your answer is not the corrrect item My control module is a circuit board with several pins out for plug on connectors to the various items that need controlling.
Which makes me wonder If I've described the issue correctly?
In any event, I'm accepting the answer and I thank you for your help.
That looks a lot closer. Thanks for the help.