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Diagonal bracing is there to keep the building from racking. How far does it go down below? Is that an exterior wall? Most times, shear panel the entire wall if you just want to be safe including the area above the new doorway. 5/8" plywood will do the trick. I like Structural 1 OSB if you are really anal but for what you need there, I would nail a piece of plywood and be done with it.
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