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I have taped all the seals with tape and I think I found those that are the reason for squeaking.
The vertical seals ("guides" of the glass) probably squeak - this is also confirmed by the lack of squeaking with the glass slightly lowered.
The problem disappears for a moment (for now for two days) after washing the glass with a glass cleaner (when spraying some liquid gets into the seal and probably "degreases" it).
I think the reason could be a detailing car washing and applying a ceramic coating...
We'll see what they will say at the dealer. They couldn't find a place of squeaking and a reason of it so far...
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