As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT 2898 THE CREW REPORTED A YAW TRIM RUNAWAY IN FLIGHT. QRH WAS FOLLOWED AND FOUND BOTH SYSTEMS TO BE INOPERATIVE. EMERGENCY WAS DECLARED AND THE AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND REPLACED THE YAW TRIM SWITCH AND ACTUATOR. OPERATIONAL CHECKS WERE GOOD. SWITCH P/N 79-2257.