What was found
PDIS 690 29-10 4895 28MAY22 SHV FACT U WHEN GEAR WAS EXTENDED ON APPROACH, RECEIVED GREEN SYSTEM LO PRESSURE #1 AND #2 PUMPS. GREEN SYSTEM QUANTITY INDICATED MAXIMUM LEVEL. WARNING LASTED APPROX 20 SECONDS AND WENT AWAY. GREEN SYSTEM PRESSURE INDICATED 3050. GEAR AND FLAPS WERE DOWN AND ALL INDICATIONS WERE NORMAL AT THIS POINT. ***EMERGENCY DECLARED*** FACT 28MAY22 13:16 SHV U TROUBLESHOOT GREEN HYDRAULIC SYSTEM LO PRESSURE #1 AND #2 PUMP IAW TSM 29-10. FOUND GREEN HYDRAULIC SYSTEM TO BE OVER SERVICED BY 2 GALLONS. DRAIN GREEN SYSTEM AND RUN BOTH ENGINE IAW JRH A300-600. DURING THE ENGINE RUN, WE DID NOT RECEIVED ANY HYDRAULIC SYSTEM LO PRESSURE INDICATION. CHECKED DPI OF GREEN HYDRAULIC SYSTEM FILTER IAW AMM 29-11-42-03-02. DPI DID NOT EXTEND OUT. SERVICED GREEN HYDRAULIC SYSTEM TO CORRECT QUANTITY IAW AMM 12-12-29. A/C OK FOR SERVICE.