The answer is really don’t need it. The programmers couldn’t count on it being there because most of the machines were sold without a math coprocessor. So 99% of the software was written to not use one.
I clearly have a bad cap that’s leaking, but my 575 board is simply saying it’s not physically installed and then occasionally it works fine.
I’m going to replace the capacitors, however is that a symptom other people have experienced?
It doesn’t say it’s defective. It says it isn’t there at all.