As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) TRIM JAMMED BELOW NEUTRAL POSITION, TRIM WORKS FROM NEUTRAL TO NOSE DOWN. DURING REPLACEMENT OF TELEFLEX CABLE, FOUND BOX TRANSMISSION GEAR LOOSE, TRANSMISSION REPLACED AND SYSTEM RIGGED. IT WAS DETERMINED THAT THE WEAR ON THE CABLE AT THE TRANSMISSION BOX WAS CAUSED BY A GEAR IN THE TRANSMISSION. THE CAUSE OF THE LOOSE GEAR WAS ATTRIBUTED TO THE LOSS OF AN ALLEN SCREW THAT SECURED THE GEAR.