As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT AB WOULD NOT ENGAGE AFTER TAKE OFF. FOUND AUTOPILOT STAB TRIM SWITCH IN CUTOUT POSITION, WORK NORMAL WITH SWITCH IN NORMAL. ACFT GROUNDED. PERFORMED DFCS LAND VERIFY GRP 49, IAW MM 22-11-00 AND HGS SYS TEST, IAW SMM 34-36-0. GROUND VERIFICATION SUCCESSFUL.