The Japanese airline ANA says it has found an electrical wiring problem in fire extinguishers for engines of three Dreamliner jets.
The problem - the latest in a series of setbacks for Boeing's 787 - was first discovered during pre-flight maintenance of a jet at Tokyo airport, an ANA spokeswoman said.
The airline said it was investigating whether the faulty wiring would have caused the extinguisher to malfunction in case of an engine fire.
After ANA reported the fault, rival Japan Airlines turned back a 787 jet en route to Helsinki to check the fire extinguisher wiring.
JAL said it was now conducting checks on all 10 of its 787s.
A fire on a 787 in July forced Heathrow to ground flights temporarily The 787, Boeing's most advanced aircraft which was designed with fuel efficiency in mind, has suffered a spate of problems since its first flight in December 2009.
In the latest incident, fire broke out on an Ethiopian Airlines 787 at London's Heathrow airport on July 12, triggering the inspection of the planes' beacons, used to locate the aircraft in the event of a crash.
Concerns over the so-called emergency locator transmitters are separate to the main electrical power supply battery faults which led to the grounding of 787 aircraft worldwide earlier this year after batteries overheated on two Japanese jets in quick succession in January.
The action led to delivery delays which caused Thomson Airways to scrap plans to use the ultra-green aircraft in May and June.
The carrier finally began Dreamliner services earlier this month.
British Airways has taken delivery of the first of its 24 Dreamliners, while Virgin Atlantic is due to receive the first of its 16 Dreamliners in September next year.
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