I don’t know if it is worth saving but I would definitely try. Just so you know, Drywood termites don’t use mud tubes and don’t require much water; they acquire the water they need from the wood. They bore into the wood and “kick” the wood out of “kick holes” so that the sawdust makes little piles near the holes. I’ve had them in wood furniture before; furniture is a favorite of theirs I guess. This link may help as it explains the difference in the “saw dust” with drywood termites and the powder post beetles. The holes, I’ve read, would be about the size of a BB with the termites. I think they are larger with the beetle. the wood would sound hollow and I think that it’s termites that give it a spongy feel.
http://www.livingwithbugs.com/drywood_termite.html
This article actually has a picture of damage from the drywood temites as well as various treatments including spot treatments: http://ag.arizona.edu/pubs/insects/az1232/
