Air Canada says a decision was made to land the plane as a precaution. The airline says the plane landed normally in Anchorage.
A new aircraft was dispatched and the plane's passengers are on their way to Narita this morning.
Air Canada unveiled the Dreamliner in Canada last May to a great deal of fanfare in an elaborate show-and-tell.
The state-of-the art aircraft can seat between 210 and 325 people, is made with carbon-fibre composite materials and features a sophisticated electrical system.
According to Air Canada and Boeing, the 787 is quieter, lighter and 20 per cent more fuel efficient than similar-sized planes, and has up to 45 per cent more cargo capacity.
Air Canada has ordered 37 Dreamliners — at a total cost of $6 billion.
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