What are the signs that indicate a rotting window frame and how can it be repaired or replaced effectively?

Signs of a rotting window frame include soft or spongy wood, visible mold or mildew, peeling paint, and difficulty opening or closing the window. To repair a rotting window frame, you can remove the damaged wood, treat the area with a wood hardener, and fill in any gaps with epoxy filler. If the damage is extensive, it may be necessary to replace the entire window frame. It is important to address the issue promptly to prevent further damage and maintain the structural integrity of the window.