I was on the highway and I hear a very loud hissing noise, I stopped , I figured a airbag blew out, my truck dropped all the way down to the bumpstops, I got it home and in my garage and it went into hard fault. I jumped the 1 & 8 wire to get the compresser to fill up so I could find the leak, I thought I could here a hissing from the rear driver airbag, so I took the air line to that bag off but no air was coming from the line at all and I still hear hissing. The leak appears to be coming from inbetween the rear two bags, I can get my hand up above the big metal piece above the axel and feel a little air coming out, but I can't feel a line up there and I see no way to take that metal thing down. Where I feel air is behind the brake lines that are up there? So does anybody have a diagram of how the airhoses go, or is there a tank back there somewher? How do I get access to those lines up there- Thanks-Josh