As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YAW DAMPER COUPLER DISENGAGED DURING CLIMB OUT. WOULD NOT RE-ENGAGE. ITEM WAS DEFERRED IN ACCORDANCE WITH MEL. OPEN DEFERRAL WAS CLEARED BY REPLACING THE YAW DAMPER COUPLER.THE FAILURE WAS CONFIRMED BY THE REPAIR STATION. FAULTY COMPONENT WAS IDENTIFIED AS THE CHASSIS FILTER. THE FILTER WAS REPLACED AND UNIT TESTED AND APPROVED FOR RETURN TO SERVICE.