As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) DURING MAINTENANCE, THE NR 2 ENGINE POWER LEVER ANGLE WAS ADJUSTED AND AN EGR CARRIED OUT. ENGINE STARTED AND ACHIEVED IDLE. WHEN PART POWER CHECK CARRIED OUT NIL, ENGINE RESPONSE WHEN THROTTLE MOVED FROM PART POWER TO IDLE POSITION. THE MAIN ENGINE CONTROL WAS DISASSEMBLED AND THE TORQUE MOTOR SERVO PISTON WAS FOUND TO BE STICKING.