I exchanged the fuses to no avail thus excluding that as the problem
Next I exchanged the backplates : the problem followed a backplate. So I have a backplate gone bad
I’m a bit surprised; I assumed the panels were the weakest link!
I believe I have the PX due to the manufacture in 2011
I have contacted Dr West and await further instructions from him. I assume he will want me to ship the faulty backpanel to the factory.
I do appreciate your help and will keep you posted!