Thanks for the help. I went to try and change the lamp this morning, and it turns out the (inline) connector between the lamp housing and the LV transformer was arcing (there is a lead of wires, then a connector, then more wire; no idea why). At least, that's my guess based on how the connector was showing visible signs of over-heating-- brown, crumbling, and slight distortion (one piece fell off in my hand as I went to break the connection). The connector will be replaced, but I want to figure out why this happened and how to prevent it from happening again. Not really necessary to keep replying, but I do appreciate you guys helping me figure out where to start.