What was found
FLIGHT 701, FRA-PHL -AT 1551Z ACARS MESSAGE WAS SENT NOTING A GREEN HYDRAULIC SYSTEM LEAK. WHEN MESSAGE WAS RECEIVED WE WERE WORKING WITH GREEN SYSTEM HYDRAULIC INOPERATIVE WHICH WOULD MEAN NO NOSE WHEEL STEERING. CREW WANTED THE EQUIPMENT STANDING BY IN CASE NEEDED A TOW TO GATE, EMERGENCY DECLARED ABOUT FIVE MINUTES PRIOR TO TOUCHDOWN. SAFE LANDING MADE AND AC TOWED TO THE GATE. MAINTENANCE REPLACED THE NR 1 AND NOT 2 EDP AND PERFORMED OPERATIONAL AND LEAK CHECK.