As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK, IN FLT ENGINE SHUTDOWN, DURING CLIMBOUT DISCOVERED THE NR 2 ENGINE THROTTLE WOULD NOT RETARD BELOW 88 PERCENT N1, HAD TO SHUT ENGINE DOWN AND LAND SINGLE ENGINE. FOUND DEBRIS IN THE THROTTLE QUADRANT AT 6 O'CLOCK ENGINE POSITION. REMOVED DEBRIS, THROTTLES OPS NORMAL PER MM.