My 2007 3400RL has the same problem but with a good size piece missing. The area around the missing piece appears to be solidly attached, and as it is under the slide and rain cannot get to it, I simply used a can of Flex Seal on it to keep moisture from the air out. That was three years ago and no problems that I am aware of to date. I suspect one could use an exterior paint and achieve the same effect. If holes go through the wood or it it is splintered, I think a fiber glass filler or application of a glass mat would work.
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