[morzh]

Well, it is not a necessity. I was given it from my work; they did not know what to do with it.
I though at the time, it was working.
When I turned it on, the traces were there but the Front Panel buttons and controls did not work.
After many power-ups it would work, then would cease to work....after warm-up it could work for a long time and I wouldn't be able to stop it from working to troubleshoot.

The troubleshooting diagram points to the main board (Main CPU plus the front end). But when I took a closer look at the Front Panel unit, I noticed this:

   
   
   
   
   

Also some oxidation in the connector that I have touched up.

Some of it are electrolytic caps, that I will need the solder tweezers to lift up, and I only have them at work, and I am back to work on 10th.

   
   
   
   

Overall, I am not impressed with the PCB routing by Tektronix, or whoever did it for them. Even if this is not the problem.
I guess, if these capacitors leaked, it is not their fault. But what I do not know, how those vias got oxidized. Vapors from leaking caps?

Worst case, I will buy a new board, but only if the price makes sense.