As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, BOTH HYDRAULIC A LOW PRESSURE LIGHTS ILLUMINATED THEN EXTINGUISHED. HYDRAULIC PRESSURE NORMAL BUT HYDRAULIC QUANTITY AT ZERO. DECLARED EMERGENCY AND RETURNED DEPARTURE. INSPECTED ACFT AND FOUND PLUG FROM LT MLG ACTUATOR DAMAGED. R & R PLUG.