Nice to see, but this is a recurring motif specific to pinball and maybe other vintage tech, where a seasoned operator has years of experience that isn't written down. Memory fades, knowledge decays, even if you have an apprentice or someone from the next generation willing to buy your business, certainly some knowledge about some vintage of technology could be lost forever.
You can pull parts out of the pinball junkyard but there are some electronic components for the early solid state era that just aren't made anymore, the proprietor of Great Plains Electronics could find updated parts from Mouser, for example, that match or exceeded the original spec, but he has retired. It's a challenging environment to keep a business like that going.
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