[f5fstop]

Ok, this is my opinon and only my opinion. But if a tech, could not reseal an oil pan correctly, I would not let him mess with pulling the trans and replacing the rear oil seal. Might be time to call Hummer, or head to another dealer. Did your repair order give a time for how long it took him to reseal the pan? I'm curious, to remove the pan, you have to drop the front diff out of the way, and remove the steering gear.
I wonder if he just tried to seal by shooting some sealant in where the leak was located?