Wiring on Epiphone Dot 339 in Gibson Custom Posted March 22, 2019 · Report reply Could be the pickup selector switch as well. But you should be able to tell if that is it by how it sounds in the middle position. At least those are easier to fix than the pots on a semi-hollow. Thank you - delighted (and no little relieved ) - that the repair guy has come back to me today. was indeed the pickup sector switch requiring resoldering. Cost minimal £12.00 UK £ - 15$ - so I'm well pleased. I will be picking it up from the shop again on Sunday Thanks for all who replied to my problem.