What was found
FUEL DISTRIBUTION: FUELED WITH 10200 AND HAD A LEFT SIDE HEAVY 500LB IMBALANCE. CORRECTED IMBALANCE PRIOR TO TAKEOFF, REACHED CRUISE AND CROSSFED TO CORRECT THE ~300LB IMBALANCE WE HAD ON TAKE OFF. ONCE CROSSFEED WAS COMPLETE A/C WAS BALANCED TO +60LBS TO THE RIGHT. AFTER A PERIOD OF TIME, WE NOTICED THAT THE RIGHT SIDE BECAME 200LBS HEAVY THEN WENT TO 400LBS HEAVY. WE ALSO NOTICED THAT THE LEFT ENGINE WAS BURNING AT A 3:1 RATIO. 60 LBS FOR EVERY 20 LBS ON THE RIGHT. WE DISCUSSED A FUEL LEAK WENT TO CHECKLIST AND HAD 2 OF 3 CAS MEASGES IN THE CANNOT CONFIRM LEAK SECTION. FUEL IMBALANCE AND RETRIM L WING DOWN. WE TRIED TO CROSSFED FROM RIGHT TO LEFT AND THE LEFT SIDE CONTINUED TO BURN. WE STOPPED CROSSFEEDING AND WE WERE DIRECTED TO LAND IN AGS. //SIGN OFF // TECHS REMOVED AND REPLACED FUEL CROSSFEED VALVE ACTUATOR DRIVE MOTOR, OPS CHECKS GOOD AT THLS TIME, REF. CE680A MM 28-20-40