Climate control cluster seems dead
 

I have a beautiful 91 PA that I just purchased. It has been garaged it's entire life. However, the control cluster for all the climate controls does not work. No matter what button you push, nothing happens. I took the fan out and wired direct to the battery and it runs great. Checked all the simple fuses and nothing is blown. When you turn on the lights, the cluster lights up but when you push a button that individual light doesn't come on. Took the unit out of the dash and all plugs were attached and wires were soft and pliable. What else can I look for and/or does the whole unit just go dead sometimes? Thanks for your help.