NHK TV says the problem emerged today in a sensor that detects overheating in the modified version of the lithium-ion batteries used in the aircraft. The batteries were encased to prevent overheating from spreading.
The report said the sensor problem did not endanger safety.
JAL offices were closed for the weekend, and officials were not immediately available for comment.
"Dreamliner" batteries overheated on planes that were in flight in Japan and parked in a Boston airport. The jets resumed commercial flights last month at JAL and All Nippon Airways.
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