Bought a used bass is this mold on the preamp?

Hi so I bought this bass used and it smelled kinda funky when I got it home but I chalked that up to it’s age and the case it came with, anyways looked at the preamp today and saw this, not sure if it’s mold or old compound that has rubbed off over the years or a ton of dust. Would musicman be able to help with new parts if the preamp ends up messed up because of this?

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