As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT HAD NO THROTTLE RESPONSE FROM THE NUMBER 3 ENGINE. FOUND UPPER THRUST CRANK ON INBOARD SIDE OF ENGINE CROSS SHAFT SECURING NUT LOOSE AND THRUST CRANK OFF THE SPRING SHAFT. REINSTALLED THRUST CRANK AND TORQUED AND SAFETIED NUT. PERFORMED ENGINE RUN CHECKED GOOD PER MM 71-00-00.