So my son says he can't get his liftgate open. I went out to look at it and couldn't get it open either. It feels like the handle is working, and we can lock/unlock it, but can't get it to open. Any ideas? It's crazy-hot here in N. Texas right now so I didn't spend more than about two minutes inside the back looking at it -- what's the easiest way to get to the latch mechanism?