What was found
(CAN) JUST AFTER DEPARTURE FROM YYZ, THE PILOTS NOTICED WHEN SELECTING FLAPS 5 TO FLAPS 2, THE LEADING EDGE FLAP INDICATOR ON THE FORWARD PANEL WENT MOMENTARILY GREEN THEN BACK TO AMBER. THE LEADING EDGE INDICATOR ON THE REAR PANEL INDICATED THE NR 1 LEADING EDGE IN TRANSIT. FUEL WAS DUMPED IN ORDER TO REDUCE LANDING WEIGHT OF THE ACFT AND THE ACFT RETURNED TO YYZ. MX TROUBLESHOT THE SYSTEM AND INSTALLED A JUMPER CABLE ON THE SLAT ACTUATOR TO ENABLE THE ACFT TO DEPART.