As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE STOPPED RESPONDING TO POWER LEVER INPUTS, THEN ACCELERATED TO FULL THRUST. THE ENGINE WAS SHUTDOWN AND THE FLIGHT WAS CONCLUDED WITHOUT INCIDENT. MAINTENANCE REPLACED A BROKEN BOLT IN THE POWER LEVER LINKAGE AT THE FCU. SUBSEQUENT GROUND RUN WAS SATISFACTORY.