DMC:
Unfortunately, the wiring, pots, switch and jack seem to be weak spots in Epiphone electrics, which is why many DIY owners will replace all of it right off the bat. Then, there are owners like me who, while aware of the situation, take a "if it's not broke don't fix it" attitude. In my case, for example, the jack ground broke off because of the typical loosening jack. So, I replaced it with a quality Switchcraft unit, instead of re-soldering and reusing the crappy stock jack.