As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB THRUST SETTING, LEFT THRUST LEVER HAD MOVEMENT BUT NO N1 THRUST REDUCTION. AFTER CYCLING THRUST, N1 STOPPED AT 93% AND WOULD NOT FURTHER TO THROTTLE MOVEMENT. INITIALLY STARTED QRH SINGLE ENGINE PROCEDURE, BUT THRUST LEVER WOULD NOT SHUT OFF. USED THE ENGINE FIRE PUSH TO SECURE THE ENGINE. (FLT 6433) REPLACED LEFT ENGINE THROTTLE CONTROL CABLE IAW CRJ 200 MM. P/N: 1603730-007