I don't know? I have no idea how to do that, cut out the wood . What is it replaced with? More wood? How do you replace it? How is the filler that goes in it's place structurally attached to what is already there? The rest of the coach roof that is. All this trouble from one little damned hole.
Why oh why didn't the PO do something better than silicone caulk. Aaarrgh!