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Boeing said Friday that hairline cracks have been found in the wings of some of its 787 Dreamliners still in production due to a manufacturing problem. Boeing told AFP the cracks were found in the wings made by Mitsubishi Heavy Industries of Japan, but insisted it was "confident that the condition does not exist in the in-service fleet." Boeing said had been notified by its wing-maker supplier MHI that "a change in their manufacturing process may have led to hairline cracks in a limited number of shear ties on a wing rib in the 787." Boeing said it was completing inspections of the roughly 40 airplanes that are potentially affected.