Ask This Old House host Kevin O'Connor helps a homeowner fix a faulty three-way switch. (See steps below.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Reproduction push-button switches are available through Rejuvenation [https://www.rejuvenation.com/]. Expert assistance with this project was provided by Switch Electric [https://www.myswitchelectric.com/]. The electrician used a continuity tester (model no. CT20) to identify the…