Otis elevators often break down.

Easy ~ easy ~ ~ The straight ladder wobbles a little during driving, which are all minor problems and normal phenomena. Let the property call the manufacturer or maintenance unit to come and debug it, and just add some oil or something. If it doesn't work, check it thoroughly and replace the damaged parts that need to be replaced. I believe that elevator maintenance manufacturers are willing to cooperate in this period when the whole country is concerned about the quality of elevator operation. Don't worry about that. In fact, the elevator is the safest of all the driving mechanical equipment, and then we can get on the plane. ...

It is almost impossible to change elevators, and the cost is too high. An elevator costs hundreds of thousands. Who will pay the bill? How do you know that changing to another elevator will not run worse than this one? Don't be objective and calm just because there are problems with individual elevators.