Hey Gogar- after performing rudimentary checks of speaker cable and other connectors (and lets face it, in static household equipment, these don't suffer the same stresses of constant set up/breakdown as does live music gear) an application of contact cleaner into mechanical components which are prone to household dust and oxidization - like the barrels of the pots, into the back of the switch mechanisms - before serious disassembly or a trip to the amp doctor - has pretty much no down side.
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