As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAIL WHEEL STEERING UNIT CAUSES YAW DAMPENER TO TURN ON UN-COMMANDED. TAIL WHEEL STEERING UNIT HAS AN ELEC COIL THAT IS UNPROTECTED BY A DIODE. THE COLLAPSE OF THE ELEC COILS FIELD CAUSES THE SENSITIVE YAW DAMPENER TO TURN ON UN-COMMANDED.