Hi, I have a 2002 RT10, having the window problem too. Always the driver's side as it gets the most use. I bought mine with 5k miles on it and wire work had already been done (poorly). Mine stopped working in the down position (at 14k) and will not move, period. Probably wires since there is no sound at all when the switch is moved. Your diagnosis may be correct. If it proves to be wires, it's the design of the wire path thru the body boot thru the door, similar to how the
Polaris RZR Pro XP Soft Rear Window has to flex repeatedly with movement. The constant excessive bending in that section ultimately kills the wires. Most cars run them vertically which moves the wiring at a minimum. Passenger door is fine, not much use. I searched eBay and Amazon for "super flexible auto wire" and found several options which I'm hoping will lengthen the repair intervals. Since there is enuf room for excess wire under the dash, I plan to park it there, so the next person (or me) has plenty of wire to work with. It's a tedious, tight quartered job at best. Good luck! SS