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The images of the rest of the boards(s) would be more helpful for me to give you a better advice.
Your problem is definitely around stepper drivers (RA), because (to my understanding) other functionalities are OK, right?
It could be driver, it could be on-board connector, it could be corrosion on board. Or dried electrolytic capacitor.. list can go on.
I think video could be uploaded if you zip it first.. but the size limitation still remains.
Link to some online mass storage would be better.
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