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Rich, I think the first thing to figure out is what wire goes where. Hooking up the signal is comparatively simple.

Electrical technicians use a device called a "tone generator" which is a transmitter box that emits a warbling tone into a wire-- you then use a probe with a speaker which is placed in close proximity to the wire and when you hit the right one, the speaker makes a noise. They are not that expensive, under $100 certainly. You could use this to figure out what goes where.

My old law professor used to say that the definition of a "fixture" which is an improvement so associated with the real estate as to be considered an inseparable part of it, was something that couldn't be removed by one man in one hour with a crescent wrench. So I don't think there's a legal argument that this equipment should have remained-- copper pipes are another matter entirely!