When I tried to pull the crankarms off of a Trek 970, I ran into a really stuck-on pair. Tried soaking in PB blaster. Still stuck. Searched the archives. Not much help there. I let them soak overnight and still couldn't budge them. I was leary about using a cheater bar on the wrench after having stipped out an crankarm before using that technique. I took my heat gun and gently heated the arm as I rocked it back and forth to keep the heat even. Once it was warm enough to be uncomfortable to touch, I gave the wrench another turn and off it popped. The trick seemed to be the heat.

Walt