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Lost Wires

I just picked up a job where the owner did his own work. Unexpectedly, halfway through the project, he died.  There is one zone that is wired to the zone valve controller, but the wires do not appear in the room.  I'm guessing they somehow got buried behind the sheetrock.  Is there an instrument that can be connected to the wires in the boiler room that will send a signal through the wires that can then be picked up with a receiver at the other end?
Often wrong, never in doubt.

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