I also have a 330 Journeyman, but I don't think that it has rigid tapping. I assume that is what you're doing. You're not using a floating holder or tapping head, right?
Anyway, I would have no idea on how to diagnose your machine. I have only recently got mine and am still getting it sorted out and cleaned up. However, I do have a number for a guy that worked on the earlier Dynapath systems (pre-Delta). Send me a PM and I will give you his information. He has schematics and some NOS parts available.