I didn’t actually take apart my right side Y axis to determine the issue. That would have been my next step if I didn’t get resolution from tech support/ customer
I can say that the ball nut did fit into the gantry tightly. Actually the fit was considerably tighter than the left side ball nut fit. I had to loosen the ball screw nut and pound the end of the ball screw to get it out of the gantry block.
I don’t believe the issue was bad machining, though I don’t know for sure. My guess is that it was a few small issues, like the smallest allowable size gantry hole with a maximum allowable size ball nut exterior.
I did ask tech support to let me know what they found with my right aid y axis but have not heard anything in this regard.
My issue has not returned since I swapped out the right side y axis.