As noted in this thread there could be any number of reasons for this. And while no thru hulls are present in the picture, it could still be a stray current issue. Zincs could be exhausted, could be over bonding, a common problem in wood boats. Could be from something as simple as an electrical cord laying in the wrong place. Hull planking on a Chris is fairly thin, under an inch even on a big one, so there isn't really a lot of wood between inside and out. Saturating the area with epoxy will be a temporary fix but the wood will likely need to be replaced. Its pretty hard to diagnose such issues from one picture. I worked on wood boats as a shipwright for nearly 30 years and I cannot say with certainty what caused this from whats seen here.
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