As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A WASHER WAS FOUND LOOSE INSIDE OF THE STABILIZER TRIM ACTUATOR. THE WASHER IN QUESTION IS NOT PART OF THE BILL OF MATERIAL FOR THE 6355B0001-03 ACTUATOR. THE LOOSE WASHER CAUSED AN INTERMITTENT FAULT THAT LEAD TO THE REMOVAL OF THE ACTUATOR.