As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING RUN-UP, YAW SAS AND BACKUP SAS CAUTIONS WOULD NOT GO OUT. DURING TROUBLESHOOTING, SHOT RESISTANCE BETWEEN PINS B AND C OF YAW SEMA AND FOUND THAT IT WAS BAD. ON AFCS BANNER UPON POWERING UP AP1 AND AP2, YAWEMA INVALID WAS PRESENT. REMOVED AND REPLACED SEMA ACTUATOR IAW AMM 67-20-00, 4-14.