What was found
AIRCRAFT WAS GROUNDED: GREEN HYDRAULIC SYSTEM QUANTITY AT 0, ECAM PROCEDURE FOLLOWED AND GEAR EXTENDED MANUALLY; EMERGENCY DECLARED ON FINAL APPROACH, AIRCRAFT LANDED SAFELY AND WAS TOWED TO GATE. REPLACED THRUST REVERSER GREEN HYDRAULIC SYSTEM FILTER LINE IAW EA308454 AND AMM 78-31-49, LEAK CHECK AND OPS CHECK GOOD.