Update - we have had decent rain since I put in a test "gasket" to help seal this area. I lifted the access panel this past weekend and did not find near as much water or debris in the area. I was using the 1/16 in. thick cork, but have determined that the the 3/32 in. thick piece of rubber will work even better (and not raise the panel to high). The gasket kit is part #4035499 at Ace hardware (you may need 2 packages). To install, cut the rubber into 1"x 6" strips. Arrange and cut the strips to fit along the lip of the compartment (I am going to use a bit of silicone to adhere the strips in place). Next, put the cover back on and use an ice pick thru the screw hole to make a small pilot hole in the rubber gasket. The final step is to screw the cover back in place...as you tighten the screw, you should "feel" the gasket making contact. Debris will still accumulate in the gap between the deck and the access cover, but the gasket should keep it from entering the quadrant area. Let me know what you think and if this works for you as well.