French-fries, I'm interjecting a comment from the perspective of someone who has owned many different brands of reel to reel decks, including a Teac 2000R. I'm also a retired "industrial" electronics technician who repairs his own stuff.
I had no success in repairing the Teac because it was not of the industrial quality that was meant to be repaired. plus I am not a professional R2R repair person; however, I bought my Technics RS1500 "used", over 20 years ago, and I have been able to modify and repair it with the Service Manual. It's built in the "industrial" manner that makes it "repairable".
Recently, one channel went out on my Sony KA3ES cassette deck; my troubleshooting indicated a bad "IC". All I needed to repair it was thing about half as big as your thumbnail. If I could have gotten the part, I would have had to take all of the inside out, just to get to it. Fortunately I had an identical deck, and took that large circuit board out of it, and inserted it into the bad unit. That deck was not constructed to be "repairable".
You have to know when to cut your losses short; apparently this guy has run into a "brick wall" and doesn't know how to tell you.
My comment is not meant to advise or help you in your current situation, but to advise you or anyone else in regard to any future purchase of reel to reels. There are only two decks, that are not super expensive, that consumers have not had a problem in getting repaired and maintaining, "that I know of", and they are Otari and Technics.