What was found
AIRCRAFT RETURNED TO PLATFORM, CADC FAIL WINDSHEAR INOP AND F/D FAIL LIGHTS TURNED ON. DURING MAINTENANCE REVISION, WHEN BOTH AIR DATA SYSTEMS WERE SELECTED TO CADC NR 1 POSITION, THE FAIL DISAPPEARED, BUT WHEN SYSTEMS RETURNED TO NORMAL POSITION, FAILURE APPEARED AGAIN. CADC NR 2 WAS REPLACED, BUT FAIL CONTINUED, THEREFORE, CADC NR 1 WAS REPLACED TOO IAW MM 34-16-01 AND TESTS WERE PERFORMED IAW MM 34-11-00, ALL CORRECT.