Welcome Dan,
This is Jim
I have many turbines, mostly early 671 and 2020's.
I volunteered a while back to help with repairs and troubleshooting.
Let me know if I can be of any help with your turbine.
You can start by telling me exactly what it does, or doesn't do when you put it on the track and power-up.
Also what model and vintage would help.
Regards, Jim