I have french doors onto my deck. These have one side that opens, the other is fixed. Dry rot has developed at the bottom of the center post on the side where hte fixed door is. It soesn't appear to go all the way through to the inside. I can't really get to this with a circular saw, jig saw or router. What's the best approach for removing the rotted section repairing? Can this been done without having to remove or dismantle the door?