another problem which is gettings worse as the rainy season in northern germany is gettings stronger:
The headlining (re-clothed by be about 1 year ago) is wet at the front left (driver) corner, from door side of A-pillat upte the middle where the lamp is. So the whole strip behind the sunvisor. Sometimes dry (when weather good) sometimes damp, or when really raining, soaking wet with occasional drips.
I checked the sunroof drain, it are free of debris, transport water and is tightly attached. All tested.
I lifted up the cover of the foor rack attachment points, all good there.
I stuck the rubber door seal (in the corner between A-Pillar and roof) which one sees when door open back onto the metal body.
Couls it be a bead sealing of the windscreen ? I have no other idea.
Here some photos I just made looseing the headliner in that corner: