may still be a bad GFCI, they do need to be replaced sometimes, that's jsut another option. If it's usually fine and just one isolated incident, could be something external, like the power outage location. If it keeps happening then most defintily replace it, In Manitoba i'm sure you get to test it frequently enough :P. And since you're in Manitoba could actually have been a lighting hit on the distribution system, rare out here, but more common in the prairies. That would defintily raise the ground potential.
|