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This seems like very high-level troubleshooting. I appreciate this, now I know where to search for my next step.

Pre-search: I assume I'm going to find a din or similar for the hand rotation as...

Recently a servo motor was replaced on the machine, for the z-axis.

The driver is throwing a fault error.
https://cadcamcadcam.com/servo.aspx

The servo is a new Hansen with a provided pigtail...