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Did you lose all AC power or just some of the outlets? What were you doing just before this happened? Did you check the breakers at the power source?
Do you have a small digital multimeter? That would be the easiest way to track this down. Are you using an electric heater? IF so, check the plug and see if it shows signs of heat around the prongs. The rubber of the plug would look melted around them. Too much amperage can do this. Let me know what you find.
Just checking back in to see if you were able to resolve this issue or do we need to dig deeper into the problem?