I was always curious what is actually inside of the electric ram.
So I kept on looking and as per the above photos and video I eventually found and got declared faulty unit.
After quick test I have discovered that this ram actually works but produces very unpleasant noise when moving the tailgate.
Dismantling of 7E5827851 unit was a bit tricky but successful. There is a gearbox between the electric motor and the driving screw.
This gearbox is a double (epicyclic gearing/planetary mechanism) made out of plastic.
One set of planetary gears (3 pieces) has failed.
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A bit of 3D printing and I am back in business
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Reinstallation was very simple but then resealing of the metal tube was another challenge but also done successfully
So now I have spare, fully refurbished ram plus another spare set of gears