What was found
DFW - HYDRAULIC LEAK (VISIBLE FLUID LEAK) NOTED STREAMING OVER LEFT OUTBOARD AILERON INFLIGHT. RETURNED TO DFW AND LANDED WITHOUT INCIDENT. RAN HYDRAULIC SYSTEM AND FOUND NO LEAKS. FOUND EVIDENCE OF FUEL IN AREA. RAN FUEL PUMPS AND BITE CHECKED ALL TANK SENSORS. NO LEAKS NOTED. FUEL IN TANK WAS 39500 AT TIME. SYSTEM GROUND CHECKED NORMAL OPERATION. ETOPS AIRCRAFT. ER INCIDENT REPORT 1841 DATED 23 NOV 2006.