BMW 5 Series F11 rear suspension inoperative. Fault finding and repair.

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Hi

A quite long video here this time.
Admittedly, was my first time working on one of this, and learning and figuring out things as you go along, it is not necessarily the easiest or quickest process...
Nevertheless, I believe that a successful result was achieved, by finding and repair the problem...
The problem, which was the rear air suspension of this car, was not working... initially not raising, and later impossible to drop!
In the end, the problem was found and repaired, without the need of any parts!

Hope you enjoy the video.
Any questions or comments put them below.
Like always, thank you for watching!