Sometimes, when your timber is deemed to be a little rotten ... what you really need to do is whip out your caulk. (Say it out loud ... we'll wait).
If you know how to handle your caulk, then you can compensate for rotting timber. Just stream your caulk everywhere. If there's a crack, fill it with caulk. If there's a hole, fill it with caulk. If something looks a little loose ... you guessed it ... hit it with caulk.
Once your caulk has been everywhere, everything will be stuck together and no-one will remember anything about your timber.
But keep an eye out for moisture damage. Even though your caulk can plug that hole ... if it's been moist for a while, there will be signs ....
RE: Your Wood is Rotten