A guy just reached out to me that isn't currently my insured, but is...

A guy just reached out to me that isn't currently my insured, but is trying to decide what to do. He noticed that the hardwood flooring in his hallway was starting to buckle, so he went under his house and it looks like his toilet has been leaking for some time and caused a lot of damage in the flooring and subflooring. He has not gone far enough yet to find the exact cause, but is thinking the toilet has been leaking around the w