[Chomper]

I am getting ready to redo my transom and I was looking at where the stringers attached and figured I would check them out. What I found was from the drain hole in the stringers back, I had very little wood left but from the hole forward was ok and all the fiberglass was strong. I was planning on pouring Nida-core for the transom. Do I need to somehow replace this wood or is there something else I can do. I don't want to cut out the splashwell. Everything looks good back there from the outside but I know that transom is wet.