I had a small leak from my shower that allowed water to run in between my tiled floor and the subfloor. There are rotted out spots on the subfloor, maybe the size of a basketball. I have an unfinished basement so I can see the underside of the subfloor. Because of the dampness of the wood I have a nest of carpenter ants between the tile and subfloor. Is it possible to remove the rotten portions of the subfloor without removing the tile above it?