"We have found small damage to the covering of the battery wiring in two Emergency Locator Transmitters," said ANA spokesman Shinsuke Satake.
The company, which operates the world's largest fleet of Dreamliners, will send the two beacons back to the manufacturer, Honeywell International.
One of the devices, which emit distress signals to help rescuers locate downed craft, had not yet been installed on a plane.
British authorities recommended that the distress beacons onboard all Boeing Dreamliners be disabled, after identifying the devices as the likely cause of the fire.
Boeing's troubled jet was grounded for more than three months earlier this year after two safety incidents involving the plane's lightweight lithium-ion batteries.
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