atakacs,
Are you an avionics/electronics engineer?
If you are, I can't see your point.
It's not the BEAs job to keep a huge store of breakout boxes, schematic diagrams, test specifications, ATE software, etc. etc. for every single board used in every single FDR in every single aircraft flying in French airspace....
If you are not, Finn47 already has answered most of your question.
CJ