Workshop of Trust – Experiences

Hi guys, I probably have quite a lot of work to do on my machine over this winter. Now I’m unfortunately anything but a technician and honestly know zero with repairs. The machine, a BMW R1100R, is from 1999 and already has 116,000 KM around… For a few months I realize that the good guy no longer brings a train on the road. She gets on the revolutions while accelerating, but does not get all this on the bike. I can only Vermu My main question is now, how can I reduce the risk that a workshop will turn on repairs that might not be necessary at all? The replacement of the coupling is extremely expensive. And I can only trust that I will be properly advised at the workshop. If the machine may still have a value of 2-2.5k, then I have to make sure that the machine is properly advised at the workshop. I would like to drive the BMW for a few more years. Between March and November I actually drive up to 20-25 km of work distance every day, in wind and weather. I also like to take recommendations for good free workshops in Hamburg and the surrounding area. Thank you in advance for your help.