Don’t they need to sign something legally binding, the moment they adjust even one minor internal part?
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.
A qualified elevator technician can definitely make an elevator fail dangerously spectacularly.
They wouldn’t be qualified if they couldn’t.
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.
A qualified elevator technician can definitely make an elevator fail dangerously spectacularly.
They wouldn’t be qualified if they couldn’t.