i dont know how true is it...but a guitar tech in my area told me that the pots used on older jem77 are different from nowadays jem..and its not the same with older RGs either...he told me not dispose the pots even after changing to other newer better pots...keep it in case i want to sell the jem in the future....well maybe a beaten up jem wont be as higher value as 1960s gibson or fender guitars...the more beaten up your jem the more lower the value...because jems are invented only in 87-90s era...
Today in 2013 a Jem is a highly prized used guitar. But in ten or twenty years they will bring in vintage CBS and pre-CBS prices. Right now at the used guitar store, which has otherwise inexpensive players guitars, has a beat up, refinished 1957 Duo Jet. It may not be great, but even then with original neck and tuners, original frets, original electronics and most original hardware, it goes for $900 dollars. Twenty years ago you couldn't give that thing away.
All older Fenders and Gibsons will get something these days, including '70s Fenders and Norlin Gibsons, and right now a few lawsuit era Ibanezes. A good lawsuit Ibanez will bring in several times original list price. The same will happen one day to the Jems and people will easily pay out ten grand for an original one.
And in time the Jems will have the same collectible value as some of those hard to find Ibanez lawsuit pieces. While the lawsuits got caught early thus lowering their production numbers, the popularity of the Jem will make them as hard to find as the lawsuit Ibanezes. I would still rather have an Ibanez L5 jazz box than any Jem but that's me. And the more original any old Ibanez, the higher the price a collector (usually non-player) will pay for it.
Keep the old pots if you replace the whole electronics harness. Even if it doesn't work, it greatly increases the value of that Jem for a collector. For 99% percent of the cases the collectors will have more money to part with than the musicians and be far more willing to spend that money.