Thanks everyone, very helpful. Felder HQ had no idea what board I had or if they would have a spare -for this 23 year old part- so the offer was to replace the entire assembly. There may be some value in that but also it's a lot of money.
I have the wiring diagram and have unscrewed the brake board which is marked : Peter Electronic?30551.00250e, I have emailed that company.?
There is a local electronic repair company that could look at this, they repair vintage equipment, but have a long lead time. I don't know if the machine will run with this removed or how to wire around it.
There is no fuse.
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