As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE PROCESS OF TROUBLESHOOTING A YAW DAMPENER PROBLEM, DISCOVERED THE POSITION OF THE SWITCH (RIGHT OR LEFT),INDICATING FROM WHICH BUS IT RECEIVED POWER, WAS REVERSED. CORRECTED THIS CONDITION AND ASSUMED THE AIRCAFT HAS BEEN WIRED THIS WAY SINCE IT WAS MANUFACTURED.