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A GFCI checks Voltage/Current difference between the hot leg and the neutral. If there is a minute difference between the two (usu. in the mV range) it will cause it to trip. This is not common, but does happen occasionally with power outages and brownouts.;)

Keep in mind that most GFCI receptacles require voltage to be present to be able to reset them. If you have no incoming voltage, the GFCI will not reset. You may want to verify the incoming voltage to this receptacle before replacing it. If there is no voltage work your way back towards the...