AHA!

I found that the 12V output from the isolation transformer was good up to the
3 bank fuse clip. Not so on the other side. Placing the lead from the VOM
on the fuse itself reads 12V, but various parts of the clip do not. It is
also reading 1V or less at the molex to the power supply. This is 12V that
needs to go to the linear power supply. It was getting less than 1V. I am
replacing that fuse clip

You can see a pic of the fuse bank here, it is index #3 on the Tron Fuses page.

Also, Bob Roberts had an awesome tip on his site. If you are like me and
you are using "curling iron" soldering irons, you know removing old solder
takes for ever. Bob writes that you should melt a little new solder on
first, then remove the old. It works like a champ! Thanks Bob!