I just started working on my leading edge wing skins (left wing) and I'm scratching my head over a couple of things. There are two 3/32" holes in the top inboard side in between ribs, and there is an access panel on the lower inboard side. I might be blind, but I don't see either of these noted on the plans anywhere. What are these holes and access panel for? They are only in the left skin, not on the one designated for the right wing.