As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STAB CH 1 INOP. STATUS MESSAGE WILL NOT ENGAGE AFTER NUMEROUS ATTEMPTS. REPLACED CH 1 WIRING HARNESS FROM THE MOTOR CONTROL UNIT TO THE AFT PRESSURE BULKHEAD. REPLACED THE HSTA 1 3-PHASE C/B, REPLACED THE HSTCU, MOTOR CONTROL UNIT AND THE STAB TRIM ACTUATORS. REPLACED THE DC BUS 2 TRU AND TESTED THE HSTA SYSTEM AND FOUND THE SYSTEM TO BE FUNCTIONING NORMALLY.