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Good news... I purchased a Fault Logic board on Ebay, plugged it in and the servo drives powered right up. Huzzah!

Is there anybody who might be able to diagnose and repair the old board so I can...

I've removed the Fault Logic board and all three of the axis drive boards. I can't find any obvious problems. In addition the transformer on the servo chassis appears to be funcioining correctly.
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Thanks Bloke!

I checked the transformer and (guessing here as I don't have a schematic for it) measured 117V across the primaries and ~19.6V across each of the secondaries.
The fuses (2 of them)...

My 1987 KM3P has been a workhorse in my small home shop for the past 14 years, but recently it has been having an issue with the Randtronics servo amplifier not powering on correctly; On the Fault...