As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE CHECKING ELEVATOR TRIM FOR FCD BE2703 DISCOVERED ELEVATOR TAB DIAL MECHANISM MOUNT ASSY HAD SLIPPED CAUSING THE TRIM INDEX MARK CALIBRATION TO CHANGE. UPON FURTHER INSPECTION IT WAS DISCOVERED THAT THE SLIPPAGE WAS CAUSED BY A PRESSED ON GEAR IN THE ELEVATOR TAB DIAL MECHANISM MOUNT ASSY THAT HAD SLIPPED ON ITS SHAFT.