Sorry for not replying sooner. I've been busy with a few other things and haven't had time to give this topic the attention it deserves.
The idea of an electrical panel is interesting. I agree that the handle looks like a good match, but I don't know enough about the electrical system to say if a panel at that location is likely. If you haven't seen it already, there's an example of an electrical panel in TTSM volume 1, page 390.