As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE POWER LEVER UNABLE TO RETARD TO IDLE OR CUT OFF. SHUT LEFT ENG DOWN USING LEFT FIRE PUSH BUTTON. LANDED AT SLC UNEVENTFUL. N1 STUCK AT 90 DEGREES. REMOVED AND REPLACED LEFT ENGINE GEAR BOX ASSY FOR POWER THROTTLE LEVER PER MM 76-11-17. PERFORMED ENGINE ASSURANCE RUNS PER MM 71-00-00. OPS CHECKS OF THROTTLE LINKAGE GOOD.