As I understand it, it was a contactor failure. I think the generators were fine. It sounded like they lost critical busses. That's why I say it was unlikely they would have continued the flight under a total AC power loss. The preliminary report was cryptic on what power they really had after they decided to continue.
There maybe something else going on with this equipment; it is the contactors throughout any electrical sytem that give the various components their warning or disagreement lights. I have not heard what type of lights were on the panels.