Finally figured out how to post the link. As I mentioned above, dummy me forgot to take the pic of the control unit with all the buttons apart. As you will see in the video, very easy to do....The only pic is #3, where the control "head" on the right is shown from the back. The large board on the left was just inspected, I did not do anything with it. Again I felt no need to unplug the ribbon.
Climate control repair C4 Corvette
https://www.youtube.com/watch?v=KBeqA1n9q9A