[quote name='Phil Starr' timestamp='1466406079' post='3075498']
You don't describe the noise so it is hard to make any diagnosis.
There aren't many components there to replace, and they are all inexpensive, so economically it might be quicker and cheaper to replace the lot and have confidence in the bass from then on rather than to replace things piecemeal. If one pot has corrosion in it because of the storage conditions then the others are likely to be not much better. If you wanted to check the pup's before you do this then use the method Rich suggested first.
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Thanks for that advice; I've asked KiOgon for the cost of a new loom (not buying until I know the pups are sound). At this point I'm taking the chance to learn my way around the existing electrics a bit and get some confidence in my soldering, so I'll try both options.
The noise is as if there's an open circuit somewhere, a rapid "beating".