Southern California Edison said video evidence had led it to look more broadly at whether its equipment might have been the cause of the deadly blaze.

On Jan. 19, almost two weeks after the Eaton fire broke out near Altadena, Calif., technicians for Southern California Edison began testing electrical equipment near the origin of the blaze. They soon noticed small white flashes appearing on high-voltage transmission lines when power was being restored — signs that the system was functioning abnormally.

The incident is one of several irregularities that Edison has been reviewing as it examines its electrical system in the wake of the deadly fire, Pedro J. Pizarro, president and chief executive of Edison International, Southern California Edison’s parent company, said in an interview Wednesday.

He cautioned that the findings were part of the utility’s ongoing investigation and did not provide any conclusive evidence about whether faulty electrical equipment had ignited the blaze.

But

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