Lots of talk about the position of the press switch.
1/ Is the switch position recorded on any device ?
If the answer is no, then we do not know who placed the switch to the position it was found in after the event or when it was placed in this position.
Another point to remember, some pilots do check A/B or 1/2 normal systems for indicated defects plus an operation check of the Man Mode/Stby Mode before flight.
Have even seen some very keen pilots using Man Mode to drive OFV out of normal position and then check A/B can control OFV, a pro-active check may be, but that system can become very very important if problems ocour in flight, plus with smoke, pilots need to have good skills using those little buttons with poss poor view.
Thoughts with all involved.