Don't believe it to be heat damage. Some form of oxidation/corrosion. While they're theoretically sealed connectors apparently they don't seal all that well.
I hardly ever drive mine in the rain. Only if caught unexpectedly and that ain't very often. Yet, based on posts here, I checked the rectifier connections on my VN2K and sure enough corrosion had started. Was able to clean it up pretty well, but I ordered two new connectors to have on hand when that time comes.
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