It is directly from the report (page 11):
In the second quarter of 2026, warranty costs and costs from proactive repairs outside of warranty obligations remained mainly at the previous year’s level and were 4.4 million euros (4.5 million euros).
I am not very familiar with the matter, but it has caught my eye before, and it certainly sounds a bit concerning.
Edit: this has been brought up in the thread before, but to my knowledge, the background of the issue hasn’t been examined in detail: