The Source of the burn looks like the Y/Z axis before I would do anything I would find the reason for the burn to start with, well made electrics parts don't short out like that without a reason (most of the time) so just replacing the board could release the magic blue smoke again.
Just from the photo looks like a cap blew and maybe one or more of the stepper drivers
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mayo77 5
buy a new board, that one looks pooched. unless you want to try and figure out whats wrong with it.. there are schematics out there.
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