Many thanks, the printer is working again! I checked the converyor hooks and found a broken hook at the rear side.
It was still snapping in, but it must have been the cause for a gap between transfer belt and roller. My spare-part-printer had also this hook broken (it was used to have a df too). As a temporarily fix i filled it up with expoxy putty and filed it back into its shape. U089 prints are fine now. So many thanks for your efforts, i really appriciate it!
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