It's a safety issue with the pax drop-down masks - some A310 fleet issue, I gather, not Luftwaffe specific.
The actual aircraft is fine. But safety rules are paramount.
If you've ever seen a Luftwaffe aircraft on the ground, you'll know how well they're maintained. No black bodge (or boche) tape or other make-dos, they're always repaired correctly. However, the wretched C-160 ('Das immer kaput!') is getting so ancient that it's hard to keep them serviceable, despite the Lw's best efforts.