By the end of September DG Flugzeugbau published TN1000-42 and TN500-13. Both TNs handle issues with the canopy locking mechanism of DG-500 and DG-1000 as well as an issue with the main-wheel axle of the DG-1000. Later, EASA published an AD regarding the canopy locking mechansim. The DG-1000 landing gear axle is not part of this AD. This is the reason why serial numbers affected in the AD and the TN differ from each other.
Please pay attention to this.