The Cougar Ace was thrown sideways when the massive ship's ballast tank was adjusted in the open seas of the North Pacific, a representative of the vessel owner said Wednesday. "There clearly was imbalance in the intake of ballast water. The company investigation ultimately will tell us what caused that imbalance," said Greg Beuerman, a spokesman for Tokyo-based Mitsui O.S.K. Lines, which owns the 654-foot car carrier. Two days after the bruised and battered crew was hoisted to safety, the disabled ship remained floating on its side 230 miles south of Adak Island in Alaska's Aleutian chain. ..... ....... Crowley...