I have noticed an area in the floor of my Sea Pro is getting spongy. It is in the center of the floor over the fuel tank. It has two round access ports(one on each end of the soft spot). I have removed those and found that their are no supports through the area and the wood layer is water damaged and soft under the fiberglass. I am unsure how it should be repaired. I am open to suggestions or recommendations of shops that handle fiberglass work.