As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR RETURN; AFTER TAKEOFF AND FLAP RETRACTION SYSTEM (A) HYDRAULIC QUANTITY WAS DROPPING RAPIDLY. ACCOMPLISHED ABNORMAL PROCEDURE FOR LOSS OF SYSTEM (A) QUANTITY. FOUND NR 1 SLAT ACTUATOR LEAKING. REMOVED AND REPLACED SLAT ACTUATOR IAW MM. (K)