Guardian: BP engineers trying to stop the flow of oil into the Gulf of Mexico have fixed a leak in the new containment system and are preparing to start critical pressure tests of the cap, the company has said. Kent Wells, BP’s senior vice-president of exploration and production, said the team had replaced the defective hose and would launch the test later today. “We landed it this morning,” Wells said of the replacement hose. “I’m expecting that we’ll start up (the test) here later this …