Keith,
The basement A/C unit in your coach was built by SCS. They went out of business in 2010, and their assets were liquidated. Victory Climate Systems (VCS) of Forth Worth Texas bought a lot of their intellectual properties, and they were making new boards for the SCS units the last I heard. I bought a new board from them in 2013. If they do not have one, Newell coaches used a lot of SCS units in the past and they normally stock the new boards.
Gerald
Gerald