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Tongue-and-groove boards interlock, which can make it difficult to repair a small area -- releasing one damaged board would mean releasing all the boards. Instead, use this patch method to replace just the damaged board.
Drill a hole close to one edge of the damaged board, toward the top, and large enough to take the point of a drywall saw.
Insert a drywall saw into the hole and cut all the way down the joint between the boards.