I assembled much of the front panel and tinkered around. I seem only to be able to get a trace under certain conditions. Although I now have a shape trace it is rolling and seems to be modulated. I know all the switches and potentiometers are dirty. this is adding to the confusion. So, I have packed the oscilloscope away for now.
When I have some switch cleaner and some more time I will try again. I would also like some way to test the old capacitors. I am thinking I may have to get the PCB out of the chassis to be able to access some components.