[ilyt]

> I would think one of the pilots would stand behind the plane and verify control surfaces via radio, but I guess that's too time consuming or error prone?

Pointless. Reversing of controls is not possible between flights.

After service it should've been on checklist to validate everything (really, if plane's computer have feedback on position it should immediately alert), but, well, I'd imagine after this it will be mandatory anyway

[HeyLaughingBoy]

No, but hardware breaks and while it may not be cross-connected, you could have the issue where one aileron or the other doesn't move at all.