You should be able to get to the catch by reaching up inside the mouth of the front bumper at the top, just infront of the aircon rad, the cable runs through there aswell, just behind the drivers side horn. Not opened it from there myself, but I was in there on the weekend installing my charge cooler rad.
Like Rich says, you can reach up inside the mouth and squeeze the latch with your fingers. I've an intercooler and oilcooler up there and can reach it ok. Bit of a fiddle till you work out the bit you need to squeeze but does work.
Replacing the cable is about a 20min job... did it a while back and is pretty straightforward.