As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ON A TRAINING MISSION, THE PILOT`S THROTTLE CABLE WAS HARD TO MOVE. ON TROUBLESHOOTING, THE MX FOUND THE ARM ON THE THROTTLE SIDE WAS VERY STIFF. FUEL METERING UNIT WAS REPLACED AND RUN-UP WAS PERFORMED OPS CHECK GOOD. NO PROBABLE CAUSE OR RECOMMENDATIONS AT THIS TIME.