I managed to get the problem fixed. In my case it was failed solder joints on the stepper motor PCB leading to the actual stepper motor itself. I just removed the old solder and soldered it again. To my surprise it seems that someone had already done something to the assembly as it was covered with red silicone which was a b... to remove. Anyway, I put the cover back on with some glue and sealed it with electrical tape just to be sure no water got in. Have been driving for 5000km so far without any problems.
(I didnt take many pictures of this procedure, but I attached one showing the solder points. One set of 4 comes from the connector and the other one leads to the stepper motor itself (my guess atleast))
Hope that someone finds this useful as these stepper motors are becoming harder to get.
-Karl
Last edited by SquareOne; Oct 30th, 2019 at 15:21.
Reason: Forgot to mention the attached image
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