My husband & I bought our first used home build in 1954 with updates. Like normal there are a couple of problems. The roof leaked around the vent in the bathroom and yes, has damaged the celing and possibly wall behide a shelf. We were going to take the shelf down and noticed behide the molding the celing is mushy. We put a holt to taking shelf down till we can figure out how much damage there is and how to repair it any suggestions on where to start the repair process. Thank you Tamie