As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING INCORPORATION OF SERVICE BULLETIN THE SERVICE CENTER TECHNICIAN FOUND GALLING ON THE ACME SCREW AND A SMALL PIECE OF THE SCREW THREAD WAS MISSING. THE PITCH TRIM ACTUATOR WAS REMOVED FROM THE AIRCRAFT AND SHIPPED TO THE VENDOR FOR INVESTIGATION. NEW UNIT INSTALLED AND AIRCRAFT RETURNED TO SERVICE.