At the Cambridge, Mass., project, carpenter Norm Abram and host Kevin O'Connor track two newly discovered problems: a shoddy beam in the living room, and damage from termites and carpenter ants. Plumber Richard Trethewey has a problem too: where to hide ductwork in the minimalist house. Meanwhile, O'Connor visits Six Moon Hill, a 1948 utopian community in Lexington, Mass. On “Ask This Old House,” projects include an ailing rose bush (in Grandview, Mo.), and leaks in a toilet and a foundation.