If the seller was aware of the defects and didnt disclose them you can
sue them for the repair cost.

I dont generally like involving lawyers, but this is big bucks.

a neighbor sold his home, he had a plumber check the main sewer line,
and was told it needed complete replacement.

he didnt disclose this fact. the buyer moved in and realized the sewer
was bad, she worked for a plumber, who knew the plumber who originally
told the 1st owner sewer line bad.

buyer got new sewer line, plus yard and driveway replacement, all paid
for by the original owner.

go get em!