Replacing drain trap; cracked drywall

Plumbing and heating expert Richard Trethewey jets off to Cleveland, Ohio to help a homeowner replace a bathtub drain trap. Then, Richard, general contractor Tom Silva, landscape contractor Roger Cook and host Kevin O'Connor ask, "What is it?" in the ASK THIS OLD HOUSE loft. On a HOUSE call, Tom helps a homeowner repair a cracked drywall ceiling.