The elevator service contractor was hired prior to installation of the elevator in question.

Looking into service tool emulator downloadable on line. What are the potential problems with that?

The problem, specifically, is that occasionally, only during a medium to high-load problem (never happens with two people, happened to me and 5 others when we were testing it) the elevator gets stuck between floors for a few minutes, then goes to the stop, lets the people off, then pretends nothing bad happened. I don't have enough time or friends to test it further in this manner. My friends all think once is enough....