Port Jib Sheet Winch Malfunction


Hi all.
I hope everyone is having trouble-free fun.

I discovered, quite by accident, that even when the power to the control panel at the helm is off at the 24V breaker panel in the galley, the button switch on the coaming and the switch on the helm panel still activate the port winch. The starboard winch only works when the breaker in the galley is closed.
I assume there must be a relay that is stuck in the closed position. Can anyone tell me where it is, and/or tell me a model, part number, and/or source in the US for this relay?
I'm guessing it's in one of the boxes accessed through the ceiling in the passageway???

Thanks in advance

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