As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH CAPTAINS AND FIRST OFFICER''S YAW DAMPER FAILED TO ENGAGE. TRIM FAIL LIGHT ILLUMINATED (RED TRIM FAIL LIGHT ON MAP). BURNING SMELL IN COCKPIT. EN ROUTE FRESNO, DIVERTED TO BURBANK AIRPORT. DETERMINED AUTOPILOT CONTROL PANEL SOURCE OF BURNING SMELL. REPLACED APP65A CONTROL PANEL. OPERATED SYSTEMS FOR EXTENDED PERIOD OF TIME WITH NO FURTHER FAILURES. OPS CHECK GOOD. S/N ON: 713, S/N OFF: 7129.