This is one of the board repairs we had going this summer. This one was quite difficult as the board was used in the water numerous times after the hull was damaged and let water in, please do not do this if you can avoid it.
You can see the side fin was broken out of the board. We pulled the fin out and then had to let this board dry for 3 weeks before we could do any work. We added a drying wick to the board to help draw the extra moisture out of the board.