Thank you for taking the time to help! I can confirm it is FBT13-50, not a 65. I guess I posted in the wrong forum.
I do see an RS1 switch, which is currently set to E. I don't have arrows on the display (must be the -65 that does). Is there a way to change language on the -50?
Where would you expect the broken diode? Is this something on the control board or would this be closer to the drive motors?
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