What was found
PILOT REPORT, IN FLIGHT WHEN USING EITHER 'A' OR 'B' A/P AIRPLANE CONSTANT DUTCH ROLLS. IN CRUISE ON A/P 'A' NR 1 HDG FLAG COMES INTO VIEW AND A/P DISCONNECTS. USING A/P 'B' IN SMOOTH AIR 24,000 GOES INTO DUTCH ROLL. ALSO, OCCURS IN CRUISE. REPLACED NR 3 YAW RATE GYRO, PER MM AND NR 2 YAW SAS COMPUTER. T/S PER 22-10-33, 22-12-37, AND 22-15-00. PERFORMED A/L AND TABLE 502 CHECKOUT, GOOD.