What was found
DURING CRUISE FLIGHT, THE HYDRAULIC LIGHT ILLUMINATED AND THE HORN CAME ON. THE PILOT SLOWED THE ACFT AIRSPEED AND TURNED THE HYDRAULICS OFF. HE THEN PROCEEDED TO MAKE A RUN ON LANDING AT A PRIVATE AIRPORT. MECHANIC DISCOVERED THERE WAS NO HYDRAULIC FLUID IN THE RESERVOIR AND HYDRAULIC FLUID WAS FOUND ALL DOWN THE LT SIDE OF THE ACFT. DETERMINED THAT LT SERVO HAD LEAKED THE HYDRAULIC FLUID. THE LEFT SERVO WAS CHANGED AND NO FURTHER LEAKS WERE DETECTED. THE SERVO HAS BEEN RETURNED TO THE O/H FACILITY TO DETERMINE WHERE THE LEAK CAME FROM.