As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT FROM HIGH ALTITUDE WITH AUTO-THROTTLES DISCONNECTED, THE RT ENGINE WOULD NOT DECREASE TO AN IDLE SETTING WITH THE THROTTLES PHYSICALLY IN THE HARD IDLE POSITION. ENGINE FINALLY RETARDED TO IDLE WHEN DESCENDING BELOW 10,000 FEET, SLOWING BELOW 260 KNOTS AND TURNING ON ENGINE AND WING ANTI-ICE. AIRCRAFT WAS BEING FLOWN ON A MAINTENANCE TEST FLIGHT DUE TO A DOUBLE ENGINE CHANGE. AIRCRAFT LANDED SAFELY. (X)