As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT #5424. DURING CRUISE FLIGHT DESTINATION YYZ WITH THE AUTOPILOT ENGAGED, RT RUDDER TRIM OF 1.5 UNITS AND LT. DOWN AILERON TRIM OF .5 UNITS HAD TO BE SET TO KEEP STRAIGHT AND LEVEL FLIGHT.UPON INVESTIGATION FOUND THE LOWER MOUNTING BOLT FOR THE #1 YAW DAMPER LINEAR ACTUATOR NOT INSTALLED CORRECTLY, REMOVED AND CORRECTLY-REINSTALLED LOWER MOUNTING BOLT.