Apologies for dragging this back to the piloting side from the very important legal issues - the other thread appears to have 'faded':
I see reference to the 3 bleed switches being found 'OFF' - where is this documented and what do folk offer as an explanation?
Some reference to the oxy valve being 'OFF' or 'half-open' - again, is this investigation evidence or gossip?
I personally discount as inconclusive the fact that the pres valve was in 'AUTO' and the 'MAN' light out at impact. We need to remember we had a 737 MCC trained steward in the cockpit at the end.