As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SECONDARY YAW DAMPER SERVO SN 1053M FAILED TO ENGAGE. THIS SERVO HAS ONLY 79.5 HOURS SINCE LEARJET FACTORY OVERHAUL. THIS SERVO SHOULD GO 3,000 HOURS BETWEEN MANDATORY OVERHAULS. INSTALLED A WARRANTY REPLACEMENT SERVO AND OPS CHECKED GOOD. (X)