What was found
DEPARTED WITH FUEL IN ALL THREE TANKS AND ALL PUMPS ON. AT TOP OF CLIMB NOTED THAT FUEL WAS BEING USED FROM LT MAIN TANK AS WELL AS CENTER TANK. THIS LED TO A FUEL CONFIG EICAS MESSAGE. COMPLIED WITH QRH PROCEDURE, FUEL TRANSFER FEED ON, LEFT PUMP OFF WHICH STOPPED FUEL USED FROM LT TANK. FOUND LT WING FUELING SHUTOFF VALVE LIGHT ON. CYCLED SHUTOFF VALVE & CYCLED DEFUEL VALVE, OPS CHECKED GOOD, IAW AMM 28-21-12.