As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GIG - CREW REPORTED LEFT HYDRAULIC QUANTITY DROPPED TO .04 (LOST ALL FLUID) AFTER TAKEOFF. EMERGENCY DECLARED RETURNED GIG LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND POWER CONTROL ACTUATOR HOSE FROM RUDDER RATIO CHANGER ACTUATOR WITH HEAVY LEAKING. REPLACED POWER ACTUATOR HOSE. SYSTEM GROUND CHECK NORMAL OPERATION.