Hey,
I have found out that the problem was with CU B itself.
Thanks for the tip, it's always good to go through the basic troubleshooting, unfortunately it wasn't as simple as that this time.
I also realised that the motors are not designated as A and B, only the CU boards are... so it's hard to tell which motor is the problematic one, other than with trial and error of replacing them one at a time.
Regardless of that, the E10E turned out to be an issue with CU B.
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