[MichaelZuo]

Don’t they need to sign something legally binding, the moment they adjust even one minor internal part?

[avidiax]

I'm not going to claim that elevator malpractice isn't possible, but no elevator is designed with a single point of failure for any safety critical system, so I don't think it's easy or likely to make a mistake that would cause a safety issue.

[lazide]

A qualified elevator technician can definitely make an elevator fail dangerously spectacularly.

They wouldn’t be qualified if they couldn’t.