I've leveled a game on location more than once. When a game is leaning left or right significantly, it can usually be improved with a couple twists (if it's not rusted up). I'm not going more than that because it's not worth my time, but I also do not trust any of the operators around here to know what level means when they don't even know what a software update is.

As far as power cycling goes... I'm also surprised by the "hands off" advice. I power cycled Skateball on Saturday at ReplayFX. The game was in a Tilt state and wouldn't resolve because the ball was trapped under the upper flipper. The flipper can't be moved because it's in Tilt, so the ball will not reach the drain. I power cycled the game, started a new game, raised the flipper and skillfully nudged the ball out from being stuck.