What was found
DURING THE INITIAL TAKEOFF ROLL, WARNING HORN SOUNDED, L/E FLAP EXT LIGHT DID NOT ILLUMINATE GREEN OR MASTER L/E DEVICES PANEL ON OVERHEAD PANEL. VISUAL INSPECTION SHOWED L/E SLATS AND FLAPS HAD BEEN SELECTED TO PROPER POSITION. AIRCRAFT RETURNED TO GATE. FOUND ON INSPECTION OF TAKEOFF WARNING SYSTEM, CIRCUIT BREAKER TRIPPED TO L/E SYSTEM. RESET CIRCUIT BREAKER AND AND OPERATION CHECK SYSTEMS FOUND ALL IN WORKING ORDER. (X)