Hi,
the video shows how to change the servo pump on a Passat 35i. The approach is the same for many comparable vehicles with hydraulic power steering. These instructions may help there too. After the change, the system still has to be bleeded, this porcedure is also shown in detail.
https://www.youtube.com/watch?v=45DjU2ifySU
The video has a German soundtrack, English subtitles are available on YouTube.
Enjoy it,
Jürgen