My guess is that they completely disassembled it and somehow reassembled it in a way that got rid of the short circuit. I just ran it again for about 15 minutes. The heat sink got a little warm, but nowhere near as hot as it used to. I doubt that the FET on the DCDS will fry again, unless maybe I run it continuously for a really long time. Why they thought they didn't fix it, I have no idea, but I'm certainly not complaining.
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