Fresh glitch on JAL Dreamliner Japan Airlines said one of its Boeing 787 Dreamliners may have experienced a battery-related problem during a flight early on Sunday, the first reported issue of its kind since electrical systems on the trouble-plagued aircraft were upgraded earlier this year. JAL said cockpit indicators on the aircraft, which was flying from Helsinki to Tokyo, warned of a problem with the lithium ion battery that supplies the aircraft's auxiliary power unit, though no damage or fault was found. Although the incident appeared to be only a minor glitch, sensitivity over any problem with the Dreamliner is high as a result of a series of issues with the advanced aircraft since its introduction two years ago. The battery involved in Sunday's incident was of the same type that burnt on two 787s early this year, causing a global grounding of the fleet in January. Service resumed after the batteries and related systems were modified in April and May, and since then there had been no reports of problems. JAL said it had allowed the Helsinki-Tokyo flight to proceed normally following the warning after it determined that there was nothing wrong with the electrical current or voltage in the auxiliary power system. The flight landed in Tokyo without incident, and maintenance crews found no obvious physical problem with the battery, which was replaced, raising the possibility of a fault in the warning system rather than the battery itself. JAL, which has responded to concerns about the Dreamliner by reporting even minor anomalies on its web site, said it would continue to investigate. Boeing referred questions to the airline. Teething problems with the Dreamliner have not stopped Boeing from receiving a glut of orders for the fuel-efficient aircraft. The US group has plans to increase production from seven each month to 10 by the end of this year, and it said last month that the figure would rise to 12 in 2016 and then 14 before the end of the decade.