I assume you have to take the door apart. I had my motor replaced under warranty on the GP. The lithium bit was for a different car that had a similar problem to you. (My GP's windows just died a horrible death, ie didn't work period)
The access holes on that car were fairly big, such that the tracks are in easy reach... I've never actually seen the innards of my GP's doors (yet)... I can look in the helms when I get home, and see if there are any special directions...