Let me break this down for you - its a pretty straightforward sequence puzzle in the testing course area. Look for the panel with four switches laid out side by side, and youll need to press them in a specific order. Starting from the left side hit the first one, then skip to the third, followed by the fourth, and finally come back to press that second switch. The green lights will show youre doing it right, and if you mess up the sequence just starts over which is actually kind of helpful. Something interesting - these arent the same as those circuit breaker switches you might've seen in the duga substation, thats a totally different thing with just three switches. Once you get the sequence right, the lab door opens up and you can keep moving through the course. If youre having trouble keeping track, just remember its basically 1-3-4-2, and watch for those green confirmation lights as you go.