The thing with the Chamber of Crafts was my suggestion, which the developer rejected. No insight into the report will be granted, and there will be no report for me even after the repair. The one-sided message from the developer is: their roofer, their expert. Damage repair in the presence of the expert. If problems arise, I would have the remaining warranty. What comes after that goes without saying. The developer is not refusing to remedy the defect. He also provides a "neutral" expert, who is sworn and publicly appointed. A lawsuit probably made little sense, as the above procedure seems to be legally correct.
Regarding the post above: it is clear to me that a publicly appointed and sworn expert is obliged to be neutral. But he also has to make a living. It’s not about a job he gets or doesn’t get. He is taken as the in-house expert.
Something else... If I have the roof opened for inspection shortly before the warranty expires, do I automatically lose the remaining warranty? Does this inspection have to be accompanied by an expert?