What was found
(CAN) RT POWER LEVER STUCK IN CRUISE AT FLT LEVEL 280-680 LB/RT FF & APPROXIMATELY. 91 PERCENT N1 92.5 N2. QRH 1.11 CARRIED OUT (ENGINE SHUTDOWN) LDG IN WINNIPEG.REPLACED FUEL CONTROL UNIT & THROTTLE CONTROL GEARBOX, SYS RIGGED AS PER MAINT MANUAL 7 6-11-17, 73-21-01. RMA (AIR CANADA REQUIRED MAINT ACTION) 76-20-1466 COMPLETED. ACCELERATE / DECELERATE GROUND RUN CARRIED OUT, FOUND SERVICEABLE. MORE INFO REQUIRE THROUGH PMI. OPERATOR SPECIFIES GEARBOX JAMMED & SENT TO POEM FOR INVEST.2000,08,09 THE PINION BEARING HAD MIGRATED SLIGHTLY OUT OF ITS HOUSING, CAUSING PINION GEAR TO COME INTO CONTACT WITH GEARBOX CASING.THIS CAUSED GEARBOX&HENCE THROTTLE TO JAM.