We recently replaced our leaky patio door, and are left with two ugly water damage spots (pictures below). I'm pretty sure the rot extends below the door and the wall on either side.
If the problem areas were in the middle of the floor, we could just cut and replace. However, since the damage extends below the wall, I'm not sure how to remove or replace the subfloor in those areas.
In case this matters, the floor below is a basement. The room below the left side rot is unfinished and we can access the bottom of the subfloor, but the spot on the right has a finished ceiling below it and can only be accessed from above.
What steps do I need to take to properly replace the subfloor underneath the exterior wall and patio door?