If your good with a saw I would say cut the soft area out. Just cut the top layer of fiberglass, pry out the rotten wood. Then epoxy the new wood to the inner layer of fiberglass. Then epoxy the outter layer of fiberglass back on that you first cut out. Next grind about 2-3 inches on either side all around the seem of your cut and apply a few layers of fiberglass. Then sand and fair as needed with filler then paint it.
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