I found this website when looking to find a repair shop to fix my Sony walkman wm-d3. I feel like I came to the right place.
Look around the forum, there's an old dedicated repair company thread and some individual posters that have done work. Do it at your own risk! In the old, old days around here the repairer would disappear with equipment. We have a few members in Europe that do work but shipping one way is like $60 USD over there.