What was found
STAB OUT OF TRIM LIGHT LIGHT ON AT 8000FT ENGAGED A AP HAD A LARGE JOLT TO AC STAB OUT OF TRIM L IGHT APPEARED. PER FLIGHT CREW CHANNEL B WORKS NORMAL AFTER TRANSITION FROM CHANNEL A. SEE ATTACHMENT FOR FURTHER EXPLANATION. 22-11121. FIM TASK 22-12 TASK 810 SUSPECT ACTUATOR TO BE CAUSE OF PROBLEM. PREFORMED BITE FOUND DFCS SYSTEM FAULT MESSAGE 22-11337 A/P ELEVATOR ACRUATOR SYSTEM A M01020 SUSPECT TTO BE CAUSE OF FAILED RESISTANCE CK BETWEEN 11-12, 12-13, & 11-13 OPEN REF FIM PREFORMED ASSOCIATED FIM TASK 22-16 TASK 828. FOUND NO DEFECTS FAULT 22-12 TASK 810 PAR F 4. PARTS USED: 29-7311-3-0028,QTY :1 CONTINUITY CHECKS AMD VOLTAGE CHECKS GOOD. PREFORMED SURFACE 40-0595-3-1976,QTY :1 00-0596-3-0635,QTY :1 40-0595-3-0708,QTY TEST SPEED AND STAB TRIM REF 22-11 TASK 851. FOUND MESSAGE :1 29-2211-3-0008,QTY :1 29-2711-9-0020,QTY :1 ADD EMP:U399274 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1687674 SN OFF 2744 ACTUATOR, AILER OFF 29-2711-9-0020 2744 ON 29-2711-9-0020 9419 REMOVED AND REPLACED CHANNEL A AUTOPILOT ELEVATOR ACTUATOR REF AMM 22-11-26. LEAK AND OPS CHECK OK. ALL LAND VERIFY TESTS PASSED. ADD EMP:U353556 INSTALLATION IN COMPLIANCE WITH AMM 22-11-26. AND RII