If you look at the panel and switch itself, the answer seems to be printed there. You select either (bottle) 1 or 2. That then will test squib L, R, and APU.
1 means L.H. bottle and 2 means. R.H. bottle and L and R refer to squibs.
That's my take, anyway.
Last edited by ImbracableCrunk; 6th April 2011 at 02:36.