What was found
WHILE AT FL 400 IN CRUISE " FLT CONTROL FAULT " CAS MSG ILLUMINATED WITH VIOLENT RT ROLL/YAW OF A/C. DISENGAGED A/P, CHG,D FC COMPUTER AND NOTED LIGHT ON RIGHT REAR FLT CONTROL SHUT OFF SWITCH, RT ELEV SHUT OFF. LIGHTED SWITCH WITH NON-COMMANDED ROLLS OCCURED SEVERAL TIMES. SLOWED A/C TO 250 KTS, LIGHTS STAYED OFF. LANDED , NO FURTHER PROBLEM. - REPLACED BOTH R/H ELEVATOR AC-U'S. LEAK AND OPS CHECKS GOOD. IN ACCORDANCE WITH CE 750 MAINTENANCE MANUAL CHAPTER 27-34-00.