As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOTS A & B WILL NOT ENGAGE. ACFT GROUNDED. DFCS CURRENT STATUS TEST SHOWED NO FAULTS. FLIGHT FAULT REVIEW SHOWS NO FAULTS. SHOOK OUT FLIGHT CONTROLS AND RAN LAND VERIFY TEST 3 SEPARATE TIMES WITH NO DISCREPANCIES NOTED. AUTOPILOT SYS ENGAGES AND OPS NORMAL, REF AMM 22-11-00-740-806.