As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT, PRIMARY STAB TRIM FAIL CASS MESSAGE AFTER TWO SECONDS OF ACTUATING STAB TRIM SWITCH UP OR DOWN FRIM EITHER YOKE. CORRECTIVE ACTION; REPLACED H STAB ACU IAW CE 680A AMM 27-40-02. PERFORMED MULTIPLE SATISFACTORY OPS TEST. NO FURTHER DEFECTS NOTED.