Just a quick notice: I called ETC yesterday about a bad Source Four Jr. Socket cap assembly (one lead wire had a severed contact to the socket base) and they said that their were a number of these units floating around. If you encounter this problem, call or email ETC tech support and they will most likely send you a new end cap/ socket assembly to fix the problem (includes the connector). The date code as far as I have seen on this fixture batch is the October 2006 batch of fixtures (marked 10/06 on yoke label). If I get a chance when I get home I will post a few pictures of the Jr. lamp cap assembly that I have to show what the problem is. However, do not use this thread as an excuse that your end cap assembly failed until you can varify that this is the problem with the end cap.