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I'm not sure if I'm looking at a whisker too thin to see, a really fat whisker or a normal part of the pot rotor.
The pot is not necessarily dead. They can be serviced. Verify the short on the boost, unsolder the pot leads and verify the short in the pot...If short is still present (and not the fault of the pot being set to min or max) on disconnected pot then unmount the pot, pry the tabs from the back cover that wrap around the front up till you can take the metal back cover off, verify the whiskers and what they are growing from, sand the growth surface lightly with very fine sandpaper till whickers are gone and surface is clean and shiny, remove metal particles with contact cleaner double check resistances are normal and reassemble.
If disconnecting the pot does not show the pot shorted but boost is still shorted keep tracing that short on the boost line.
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