As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON RIGGING CHECK, THE ELEVATOR TRIM SYS WAS MOVED THOUGH RANGE OF MOTION. THE SYSTEM BECAME LOOSE AND IT WAS DISCOVERED THAT THE SPROCKET SHAFT HAD BROKEN AT THE INSTALLATION ROLL PIN LOCATION. IT IS OUR BELIEF IT BROKE AT A PRE-EXISTING CRACK FROM FACTORY INSTALLATION. NEW ACTUATOR ORDERED AND WILL BE INSTALLED.