Vlad,
I cut out a piece of Aluminum and patched it. I also used "proseal" to insure no water would infiltrate it.
If memory serves me right the Flap fairing covers it up.
The Flap fairing covers it completely . The flap fairings make no sense until you fit the wings and flaps . Can email you some photos , one 666 to another .
It has been a few years now from when I saw this on a test, but. The answer should be in "AC-41.13". If you go buy it, you will be covered.
Yours as always R.E.A. III #80888