Great...now we can all breath easier knowing there's not an elephant in the back pushing against the door keeping it from opening.
You access the actuator from the inside of the liftgate. There are screws that hold the plastic molding in place, I can't remember the exact locations but they aren't hard to locate.
Just disconnect the negative battery terminal, remove the molding, and you'll see the black actuator at the handle area. Buy your new one first if you aren't sure what your lookin' for. Disassembly and installation of new part is self-explanatory once you're looking at it.