Welcome to the forum and irv2.
Congrats on your CS many safe travels ahead for you.
Below in my signature are links that will apply to your coach and here is a link
from one of them that may help you from QT's # 3
There is other AC information in QT's 1 & 2
for older coach's.
Its possible you only have a DIP Switch on 2nd zone AC control unit not on, that the control unit can not see zone 2.
In QT's # 3 there is also a CS section for other items that you maybe interested in.
Check the links and keep us informed as to how your making out.
Enjoy the forum and safe travels.