As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 1767- AIR TURNBACK - ON TAKEOFF RAISING LANDING GEAR "A" HYDRAULIC QUANTITY WENT TO ZERO. ENGINE DRIVEN PUMP LIGHT ILLUMINATED. PUMP TURNED OFF. MX DICOVERED THE "A" HYDRAULIC SYSTEM EMDP ACOUSTIC FILTER LEAKING. MX REPLACED THE EMDP ACOUSTIC FILTER. OPERATIONAL / LEAK CHECK WAS GOOD. THE A/C WAS RETURNED TO SERVICE.