TÜV Fehl – 2. Opinion

Hello together, since I have been driving the Kawa very rarely for the last 3 years, I want to sell it now. Tüv expired last year. So I went to a motorcycle house to make the TÜV there. Since the last Tüv I drove about 500km. At that time, at the same workshop, new tires, new chain and new pinion were attached. Now my Kawa did not pass the TÜV. Defects is a game in the camp at the suspension of the rear wheel. Cost approx. 400€ according to the workshop. The value of the Kawa is perhaps 130€. I have now thought about changing the camp myself and took a closer look at it. So I picked up the rear wheel with a stand and searched for the game in the camp at the suspension in vain. Now I would like to get a second opinion. But where should I go? I can’t go to a free workshop, which also offers Tüv, since the same TÜV makes the control there. I think already that it is in a database I’m not allowed to go to a free workshop without a TÜV appointment, because the TÜV has expired. What should I do now? How do you control the camp exactly during the suspension? I pulled and wobbled a lot, but couldn’t find any game. Where I did the Tüv, could or didn’t want to show me, because there was too little time. It’s been funny. My guess is, that they might want to exchange something that is not necessary. In addition, a game like this should have been noticed before the last 500km, so before the last TÜV!? Can you give me a piece of advice here? Thank you in advance. MfG