What was found
AT CRUISE, THE ACFT HAD A GREEN SYS HYD FAILURE, WITH PRESS & QTY LOSS. THE CREW BURNED OFF THE PUMP IMMEDIATELY. THE FLIGHT DECLARED AN EMER & RETURNED. ON APPROACH, THE GEAR WAS MANUALLY EXTENDED. AFTER LANDING, THE ACFT NEEDED TO BE TOWED TO THE GATE. R &R THE NR 1 ENG HYD LOW PRESS SWITCH TUBE, SERVICED THE GREEN HYD SYS RESERVOIR TO THE PROPER LEVEL & RESET THE GEAR MANUAL EXTENSION HANDLE.