As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTS NR 2 ENGINE WILL NOT REDUCE FROM CRUISE POWER SETTING WITH THROTTLE AT IDLE. ENGINE SHUTDOWN FOR LANDING AT SLC DUE TO NO RESPONSE FROM THROTTLE. FOUND THROTTLE CRANK ARM NUT AT CROSS SHAFT BACKED OFF. REINSTALLED THROTTLE CRANK ARM TO CROSS SHAFT, TORQUED AND SAFETIED. JOB CARDS ARE BEING REVISED TO CHECK THIS NUT.