Synopsis

Plumbing and heating specialist Richard Trethewey assists a homeowner troubleshooting a dishwasher with an unpleasant odor. Later, Trethewey joins landscape contractor Roger Cook, host Kevin O'Connor, and general contractor Tom Silva as they ponder the question: "What is it?" Cook then travels to Iowa to help a homeowner transplant a rose bush. Back in the loft, Silva demonstrates to O'Connor the correct technique for replacing a circular saw blade.