LOSS OF SHIP'S GEAR REPORTED Tokyo(UPI)--A U.S. missile cruiser lost its secret sonar and navigation equipment when it rammed a breakwater at the entrance to Tokyo Bay, the Kyodo news service reported today. Kyodo quoted informed sources as saying the 7,800-ton San Diego-based Leahy's secret sound-navigation and ranging equipment was destroyed in the Sept. 21 accident and fell overboard at the site of the collision. U.S. military spokesmen at the time said only that the ship's fuel tank was slightly damaged, resulting in a small amount of oil leakage. Kyodo said that Japanese and U.S. military experts estimate the cost of the accident at $15.8 million, adding that the price of the sonar alone was nearly $10.5 million. It said officers at the U.S. naval base at Yokosuka south of Tokyo were concerned about what steps should be taken against Capt. S. S. Pearlman, skipper of the Leahy. The Leahy has undergone repairs and been equipped with new sonar equipment at Yokosuka and was scheduled to leave for its homeport of San Diego upon arrival of Pearlman or his successor in Yokosuka, Kyodo said. SKIPPER FACES NAVY DISCIPLINE Disciplinary action is pending against the skipper of San Diego-based missile cruiser who has been relieved of his command and assigned temporary duty here in the aftermath of an accident that caused an estimated $16 million in damage to his ship. Capt. S. S. Pearlman was relieved of command of the 7,800-ton Leahy Saturday while the warship was in Yokosuka, Japan. The accident occurred Sept. 21 when the Leahy struck a breakwater in Tokyo Bay, losing its sonar dome and tearing holes in the ship's side, a naval spokesman said. Officials said the secret sound navigation and ranging equipment was destroyed in the accident and fell overboard at the site of the collision, at the entrance to Tokyo Bay. At the time of the accident, a military spokesman said only that the ship's fuel tank was slightly damaged, resulting in a small amount of oil leakage.