What was found
FLT NR 973 - NGO - THE A/C PITCHED DOWN SLIGHTLY DURING APPROACH TO NGO. THE OUT OF TRIM LIGHT FLASHED AND THEN THE HYDRAULIC SYSTEM 3 ELEVATOR OFF LIGHT ILLUMINATED. THE SYSTEM NR 3 HYDRAULIC QUANTITY GAUGE READ DOWN .5 GALLON. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE NR 3 HYDRAULIC SYSTEM WAS SERVICED. THE SYSTEM WAS PRESSURIZED AND THE SLATS, FLAPS, STABILIZER, AND RUDDER WERE OPERATED WITH NO LEAKS FOUND. THE NR 3 ENGINE WAS MOTORED AND NO LEAKS WERE OBSERVED. MAINTENANCE FOUND THE SYSTEM NR 3 RESERVOIR RELIEF VALVE STICKING AND THE OVERFLOW BOTTLE FULL. THE NR 3 SYSTEM RESERVOIR RELIEF VALVE WAS CLEANED AND OPERATION CHECKED GOOD. (M)