As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/A, WHILE CLIMBING THRU FL 345 TO FL 350 (500 FT TO GO), AT 500 FT PER MINUTE THE A-AUTOPILOT PITCHED UP TO CAPTURE THE ALTITUDE WITH A 1500 TO 2000 FPM CLIMB. CREW HAD TO INTERCEDE TO PREVENT OVERSHOOT IN RVSM AIRSPACE. RESEATED A A/P PITCH CHANNEL AND TESTED PER MM 22-12-01. NO FAULTS FOUND.