Hi Joe:
I got those files too. Thanks for pointing them out to the rest of the membership. Interestingly enough, they came up with a few more circuits and I was able to find these files too, but it took a lot of digging. Never had an issue with them as well but you are right in that they would be easy to duplicate if a replacement were ever needed.
When you read about the construction techniques that were used to make these, you would think this was an inspiration for printed circuit boards, integrated circuits and surface mount type technology we use today. Amazing how these are all linked together in some form of synergy.
Best,
Gerry