As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BACKUP SAS FAILED IN FLIGHT. AIRCRAFT DOES NOT PASS AP TEST. BACKUP SAS AND YAW TRIM STAYS ILLUMINATED. TEST PILOT EVALUATION FOUND HISTORIC CODE FOR PITCH GYRO TO BE INVALID WHILE IN MAINTENANCE MODE. SUSPECT PITCH GYRO TO BE FAULTY CAUSING BACKUP SAS LIGHT TO ILLUMINATE. REMOVED AND REPLACED FIBRE OPTIC GYRO IAW 22-10-00, 4.3. TEST FLIGHT SUCCESSFULLY COMPLETED IAW AMM 05-60-00, 6-1.