As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING BETWEEN FL 370 AND 390, LEFT ENGINE RETARDED JUST ABOVE FLIGHT IDLE AND WOULD NOT RESPOND TO ANY THROTTLE MOVEMENT. AFTER DESCENT PASSING THROUGH FL 340 LEFT ENGINE RESPONDED THEN FROZE UP AGAIN. THE FLIGHT DIVERTED INTO CYQX. A MAINTENANCE TEAM WAS SENT TO CTQX AND TROUBLESHOT SYSTEM TO FUEL CONTROL. THE FUEL CONTROL WAS REPLACED ALONG WITH THE FUEL PUMP AND THE ENGINE TRIMMED PER THE MAINTENANCE MANUAL. PLEASE NOTE THAT AFFECTED ENGINE IS JT9D7R4E4 WHICH IS NOT AVAILABLE AS AN OPTION IN BLOCK (C) OF THIS DATABASE.