Hi D500, you would be surprised at how many tracking problems I have fixed by adjusting the ballast of a switch or a minor adjustment of the pick-up rollers.
I had an old Williams engine, an FM that would not take an O-72 turn. It turned out to be a power wire was a little to short to allow the motor to move through a turn, or a switch. Just goes to show ya, it's not always a complex fix to our problems. Sometimes it just takes a close look.