Monte,
I'm not familiar with a G275 either?
Have you tried ECI America or world electronics? I know you can send the board in and they will repair it for you. We use both and I've always been happy. My only trouble is liking them both!
How many boards are in the cage?
How many cars 1, 2, 3?
Westinghouse was good at placing data plates on their controllers, hoists machines and car tops. Would you post what you can find? And where you found it?