As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT WAS EXPERIENCING A SLIGHT NOSE LT NOSE RT OSCILLATION DURING CLIMB AND CRUISE. PFCS SHOWED MINOR OSCILLATIONS OF RUDDER ALSO. TURNING OFF YAW DAMPER, RIGHT TO LEFT MOVEMENT OF ACFT STOPPED . PERFORMED OPS TESTS OF THE YAW DAMPER ACTUATOR IAW AMM TASK 22-11-36-710-801 OBSERVING PFCS AND INTEGRATED CDS. ALL TESTS ARE GOOD. RETURNED TO SERVICE. NO PARTS REPLACED.