Although I am not currently taking on outside repair projects, I used to do that (along with restoring my own tuners and other Tandberg pieces) and have serviced quite a few 3001/3001A tuners. As mentioned, a post in the tuner forum is a good place if you want to go into the details on your stalled repair.
Alternatively, you can hit me up by PM ("Conversations" if you want to talk about buying a replacement. We don't do buying/selling in the forums here.
Welcome to Audiokarma!
John