Dear Monty: We lived in our first home for about three years and sold it almost two years ago. We had three offers. The highest offer was at our list price, and they waived the inspection. The other two bids were lower but required an inspection, so we accepted the highest price. We had a plumbing issue a year after we bought the house and had it repaired. In the seller condition report, we reported the problem. We furnished the plumber’s receipt, stating that the plumbing was in good condition. The buyers threatened to sue us, saying we tried to hide and fraudulently underrepresent the issue because the sewer backed up for them. Do they have any ground to stand on?…