Windows

I had water leaking into my windows/house due to dry rotted wood on the exterior. The exterior dry rotted wood is now repaired and I was working on repairing the interior damage when I came across an area around the windowsill that seems to be rotted through either the drywall or some I internal wood. I would like to have someone look at the rotting to ensure structural integrity and repair if need be. I also have dry wall patching that needs to be done due to a leak in a bathtub that has been repaired.