As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAINS PFD BOUNCES UP & DOWN OCCASIONALLY CAUSING AUTOPILOT TO PITCH YOKE FWD & AFT RAPIDLY. SOON THEREAFTER AUTO THROTTLES, AUTOPILOT & FLIGHT DIRECTOR ALL FAILED. R & R VERTICAL GYRO IAW AMM 34-23-01. PERFORMED RTS IAW AMM 22-01-05. OPERATIONS CHECKED GOOD WITH SYS.