Thanks much for the above suggestions, links and coments.
I made one more call to King Controls and the tech support guy suggested replacing the data line which is the telephone cable running from the back of the tuner to the control panel that has the display showing what the roof dome is doing.
Well.... when I took the controler off it's mounting apperantly the connection plug on the telephone cable was not making good contact because when I unplugged it and plugged it back in the panel lit up and it appears to be working now. I will be moving the coach tomorrow so we will see if it continues to work okay.
So far it looks like a happy ending to this mystery.