As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGAGED AUTOPILOT A AT FL340 TWO SECONDS LATER DISENGAGED. MADE TWO ATTEMPTS, BOTH TIMES DISENGAGED AFTER TWO SECONDS. RESUMED AUTOPILOT B OPERATIONS. GROUNDED - YES. REMOVED FLIGHT CONTROL COMPUTER CH A IAW AMM 22-11-33. REPLACED FCC A IAW AMM 22-11-33-400-801 STEPS F AND H. NO DEFECTS. REQUIRES LLM MAINTENANCE BITE GROUP 35 AND LAND VERIFY BITE GROUP 49. ACCOMPLISHED BITE GROUPS #35 & #49 REF AMM 22-11-33 & 22-11-00, ALL OPS NORMAL.