And another thing
In the Conclusions to the official report it is quite clear that the engineers actions were neither causal nor contributory to the accident.
Also the investigation found that the Flight Crew were Qualified, medically fit and well rested, and the aircraft carried no deferred defects.
It doesn't get much better than that, so where is the link between the management and the accident!
So what did cause this accident, and why were both audio switches to MASK and both air bleed switches OFF?