Cassette Deck Repair

I have a Yamaha TC520 in near mint cosmetic condition but it's not working. The mechanism will not fully engage at all times when I try to play a tape. In other words the levers don't depress fully. When I do get some sound it's from one channel only and a bit distorted.   I was interested in taking it to a repair shop in the S.F. Bay Area after I had read reviews on how many people were raving about their vintage gear sounding better than ever after servicing from this shop. When I called he told me he doesn't work on Cassette Decks, too difficult. I was frankly kind of shocked.  I know of another repair shop that is much closer to me but I have some issues with the guy and his over all skills.  Any suggestions? Is it worth fixing? I would utilize it as background music while working on hobbies. Thanks in advance.