Note that you have to switch the machine off properly, otherwise the brewing unit can't be removed, it is stuck somewhere at the back. If the machine shuts down normally, the brewing unit gets reset to a state where it can can be unmounted.

Remove the leak tray

Open the side door

place 4 fingers in the grip, and push the lever with the thumb, it should come out easily [Video](https://www.youtube.com/watch?v=VcYhWeYP...)

This particular one had a strange issue: the feeding funnel connection to the exit tube faced the wrong direction, which meant rotating the top part of the brewing mechanism 180°. Perhaps it was from another machine, perhaps someone else reassembled it incorrectly.