Right now its a part tile floor and part vinyl, under both of which is OSB. The plywood sub floor and joists are both fine, I as told. I've already torn out part of the vinyl, and am starting to chip away at the OSB boards that are obviously swollen beyond hope. Now for the questions, since I've never done anything like this before.
How can I know which OSB absolutely must be replaced? Can I just eyeball it? Some parts that got wet dont show any swelling; other parts I dont remember whether they got wet or not because the damage is old. I dont want to remove boards that are OK, and I dont want to find out when I'm (or whoever) start to put down the vinyl that there are still bad boards.
Other than that, what do I need to be aware of as I do this? I'm worried I may accidentally damage the subfloor (though I cant imagine how) or do some other expensive mistake. There is very little mold.
I'm guessing I will have to remove a min of 5-6 OSB boards across two rooms, but at worst it could be closer to 10.