The entire fleet of 787s was grounded earlier this year thanks to repeated faults in the lithium-ion batteries which sometimes led to plane fires.
Today, it was revealed that an oven overheated and caused smoke in an Air India Dreamliner this week. India's aviation regulator is investigating the incident, which did not interrupt services.
According to tracking service Flightaware, the aircraft, registered as A7-BCB, has not flown since Sunday - an unusually long time for a long-haul jet designed to save on fuel bills.
Qatar Airways confirmed an aircraft had been taken out of service, but said no flights had been cancelled as a result.
"This is a minor issue for us, and not an incident, so we are not commenting," an airline spokesman said.
A failure in a similar bay caused a fire during a test flight in 2010, and three of the jets, including one owned by Qatar Airways, had electrical problems last December.
A fire-brigade supervisor in Doha said it did not have any record of an incident with an airport-related call last week.
The U.S. Federal Aviation Administration and Boeing instructed airlines to inspect or remove the beacons, after UK investigators found two wires pinched together in the beacon inside the Ethiopian Airlines Dreamliner at Heathrow.
The resulting fire caused extensive damage to the plane.
Last December, three 787s had electrical problems that were made public.
United Airlines experienced problems with electrical panels on two 787s, one of which diverted to another airport during a flight from Houston.
Qatar Airways said that month that it grounded one of its 787 jets because of the same problem United had experienced. Boeing later traced the problem to faulty circuit boards in the panel.
In January, regulators grounded the global fleet of 50 Dreamliners after batteries burned on two jets within two weeks.
Qatar Airways Chief Executive Akbar Al Baker said in May that the airline had to forego $200million in lost profit because of the grounding of 787 planes, but has received compensation from Boeing for the losses.
At least one other airline says it is still seeking compensation.
Aviation experts say it is common for the reported number of incidents to rise when an aircraft is in the spotlight, and that all new aircraft models have incidents when they first enter service. The 787 went into service in the autumn of 2011.
Even aircraft with decades of service regularly suffer glitches that go unreported and rarely pose a direct threat to safety.
However, aviation experts say U.S. and British authorities investigating the previous fires may try to establish whether anything can be learned from a pattern of reported incidents connected in various ways to the jet's electrical systems.
