As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REPEAT WRITE UP. AS SOON AS AUTOPILOT WAS ENGAGED, YOKE BEGAN MAKING ERRATIC AND ABRUPT FORWARD AND AFT MOVEMENTS. FOR THE SHORT TIME THE AUTOPILOT WAS ENGAGED IT WAS CONTINUOUS. REMOVED AND REPLACED NR 1 AND NR 2 INVERTERS IAW MM 24-20-01 OPERATIONAL CHECKS GOOD.