We recently picked up some Gen 2 units. Otis was so pissy about losing their GEN 2s, they sent mechanics to remove the belt monitors after they lost the service. As an elevator mechanic, I don't think it's good judgement to remove a safety device from a system just because the boss is pissed he lost it.
If something were to happen to the belts and the monitor was removed, I believe the mechanic that removed the device would be held liable in court. This would be no different than disabling and jumping out any other safety device. If your an Otis mechanic and the boss is asking you to remove these devices, you should take a minute and think about the consequences. That's why we sit in those 8 hour pace classes. We're supposed to know better.