What are the signs that indicate a rotting subfloor and how can it be repaired?

Signs of a rotting subfloor include sagging or uneven floors, musty odors, visible mold or mildew, and soft spots when walking on the floor. To repair a rotting subfloor, the damaged area must be cut out and replaced with new plywood or OSB. It is important to address the source of the moisture that caused the rot to prevent future damage.