As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C YAWED CONTINUOUSLY LT AND RT AT HIGH SPEEDS. T/S FOUND M509 RT UPR YAW DAMPER SERVO LVDT RESISTANCE VALUE ABNORMAL AND M317 O/B SPOILER NR 12 PCA LVDT PIN 8 SHROTED TO CASING. BOTH M509 RT UPPER YAW DAMPER SERVO AND M317 O/B SPOILER NR 12 PCA REPLACED. YAW DAMPER SERVO INSTALLATION TEST O/B SPOILER NR 12 PCA INSTALLATION TEST NORMAL.