As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUE TO REPEATED REPORTS OF THE HORIZONTAL STABILIZER TRIM JAMMING OR BEING INTERMITTENT THE HORIZONTAL STABILIZER TRIM GEARBOX WAS REPLACED. SHOP FINDINGS ON THE REMOVED GEAR BOX REVEALED THAT THE UNIT WAS JAMMED FROM CORRODED BEARINGS AND EXCESSIVE WATER IN THE SCREW HOUSING.