Comment Two simple questions. (Score 1) 150
1. Were the safety guards, which were optional, installed?
2. We know investigators are looking into the computer system, does this mean the computer can also set the switch settings?
If the answers are "no" and "no" respectively, it was likely an accidental bump.
If the answers are "yes" and "no", then one of the pilots lied.
If the answer to the second one is yes, then regardless of the answer to the first, I'd hope the investigation thoroughly checks whether the software can be triggered into doing so through faulty data or the existence of software defects.