Hi, what you need to do is turn cooker around and undo back plate. Then just follow up the pipe from the burner im sure it goes up the side of the oven caseing. But will have to give it a wiggle to make sure. Im sure it then runs along the top of the oven box so to speak.
I had to change mine last year. Its a bit fiddle in places but not hard to do...Hope this helps..
Big eee
March 2011