As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPPER RUDDER B IN CRUISE AT FL240 WENT LT 4 TIMES IN 5 MIN CAUSING AIRCRAFT TO YAW WITH A HARD BUMP. REMOVED AND REPLACED YSAC-B COMPUTER WITH UNIT INSPECTED BY HONEYWELL. OPERATIONAL AND RIG CHECK NORMAL. WORK IAW CESSNA 750 MM CHAPT 27-24-01