My 07 Tahoe rear lift gate will not open, the problem is when I open the drivers door I hear the actuator trigger, but only opens the first step, if I push the button on the rear lift gate, it will not open the rest of the way. Since there is not any other way of opening it (GM messed up with that), how in the hell do you get it open without taking it to the dealer and pay a fortune. I want to get it open to remove the interior trim panel and see if I can fix it myself.