Bsquared,

Does the door open all the way with power off? If so, you have a problem with the drive and there's not much you can do at that point other then replace it in my experience. You can try to get it to do a learn but usually if the drive is gone it wont let you. If it doesnt open all the way without power you're obviously looking at some mechanical problem ie. restrictor catching, binding in the rollers etc. Keep us updated