As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF AFTER FLAP RETRACTION A HYDRAULIC SYSTEM QUANTITY DROPPED TO ZERO. LOW PRESSURE LIGHTS ILLUMINATED ON PUMPS. MANUALLY EXTENDED GEARS, ALTERNATE FLAP EXTENSION. RETURNED TO DEN. *S/D* REPLACED NR 2 LEADING EDGE FLAP ACTUATOR DUE TO LEAK.