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I do not have the wiring diagram for the house so I do not know what else shares the lain line feed. I know the refrigerator does, but I unplugged it and the GFI would still not reset. I did check for power (black to ground voltage is 120vac so power gets to the source connection on the GFI)
I found one lamp in my dining room on the same circuit breaker which, when I unplugged it, allowed the circuit preaker to reset
Thank you for your help