It looks like they come apart pretty easily. If you do the work yourself, UNPLUG them first! Then try cleaning the volume pots with Radio Shack electronics cleaner, both sides of the rotating pots. Saturate them well as there may be quite a bit of residue that needs to be cleaned, rotate them through their full range of motion. Let them dry, put it back together and see what happens. If they still don't work, see a qualified tech for a more thorough repair. Keep in mind, however, that capacitors STORE electric energy, and can discharge if you short across them (lethal voltages may be present), so, if you don't know what you are doing, PLEASE seek the services of a qualified tech.
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