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That should be repairable using reasonable care. I would consider carefully unsoldering the wires from the lug, removing the lug completely from the phenolic, cleaning up all the carbon, and remounting the lug (or a new eyelet/tie point of some type) on a bit of FR-4 epoxied over the original location.
If your B+ is higher than spec, then the pulse voltage at the HOT cap will be, as well. But that was probably an existing carbonized area that decided to arc over due to dust/contamination or whatever.
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