As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT CHECKS, THE PITCH TRIM MIS COMPARE CAS MSG ILLUMINATED. TROUBLESHOOTING THE PITCH TRIM MSCP EICAS MSG USING THE LEARJET SMART & FOUND THE STAB ACTUATOR TO HAVE A DIFFERENCE BETWEEN THE PRIMARY & THE SECONDARY SYS. THE DEFECTIVE ACTUATOR WAS REMOVED PN 2A9209B SN B0827. ACTUATOR TIME IN SERVICE 4894.7HRSTT 67.9HRSTSO.