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Swr workingman 12

I have a SWR workingman 12 pre fender slant face,it is an indestructible amp until now,my knobs(or pots) are getting crackly when I adjust them,of coarse no big deal at home but onstage or in front of people in general it is embarrassing,can a luthier fix the knobs(or pots)by cleaning them or do I have to replace each one individually?the latter of coarse would be the most expensive road but as I love this amp and it's never left me stranded(so to say) I find it hard to replace.