U.S. lawmakers and the Pentagon are investigating the diversion of a shipment of unserviceable F-35 Lightning II fighter jet components from Australia to Hong Kong, an incident that has raised concerns about potential exposure of sensitive U.S. stealth-aircraft technology. The shipment was intended to travel from Australia to the United States for repair but was rerouted while crossing the Pacific, Politico reported Friday, citing three people familiar with the matter. The components were being transported by an intermediary for F-35 prime contractor Lockheed Martin, but it remains unclear why the shipment was diverted, whether it was a mistake or an…