troubleshooters are a dying breed, 20 years ago, the company would groom a likely suspect to be there go to guy. That guy would eventually work on enough problem elevators over the years to be confident enough to work on any equipment. Although he may not be an expert on all equipment, he had a good working "elevator knowledge", and given the time, he could fix most problems. The company was an essential part of this process, they would give the guy all the time he needed to learn and fix the unit. over time, his knowledge grew, and when he showed up to fix a tough call, he could rely on years of memories to help him fix the unit quickly. Unfortunately most companies are no longer doing this, they have the young guy call a service center that has an expert on the equipment he is working on. the expert, may help him fix it, but unfortunately the mechanic on the other end will barely understand what the expert is having him do. when all is done the car is running, the mechanicy has no clue as to why, and life continues. now you know why the union hall will laugh when you ask for a troubleshooter, there are only a handful left. and that is unfortunate. this is a tough business, and with the mix of old and new controllers, the young mechanic has his hands full.