"About 3 weeks later I get a call from the home owner saying..." I think Brian B. might be stating that the seller, not his client, is calling for repair. If that's the case, I would ask if she was given a copy of the report showing it was already a problem. Then I would explain that I don't fix stuff that I find and report as wrong. I know, they'll say it was fine 'till YOU showed up. In 21 years, I have replaced:
A cheap plastic shower head (snapped off in my hand). A section of oak flooring (the dishwasher wouldn't turn on when I was there, but magically ran, long after I left the vacant guest cottage. The contents of one freezer.
Sometimes I need to learn the hard way, but I wouldn't consider a claim for something that failed due to a reported condition.