I wouldn't do anything. I don't think what you did would be considered giving legal advice, or anyone who suggests that someone contact a real estate attorney would be guilty of that. That would include almost every realtor in the US. The seller didn't disclose properly, and the last inspector (if there was one) was incorrect. I wouldn't do a thing except prepare some documentation for a report to the state realtor board if they keep pressing.

Hey, that's funny. Whenever I type realtor it comes up as a spell check error.

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Jim Robinson
New Mexico, USA