Hello, I think that these instructions written in German can be useful to all those who have or have had problems with the dreaded Servo. They can be easily translated with GOOGLE TRANSLATE, and in my opinion they are very detailed and precise about the problems that arise with the Servo. The author made these instructions about 20 years ago and they are posted on his personal web page in the download area:

http://becker-maschinenbau.com/download/klimaautomatik.pdf

In my opinion it is an admirable work and deserves to be known, for that reason I have allowed myself to share this information in this forum.

Many thanks to Heiner Becker