What was found
INFLIGHT EMGERGENCY DECLARED FOR LOSS OF CENTER SYSTEM HYDRAULIC PRESSURE ON FINAL APPROACH. AIRCRAFT LANDED SAFELY AND WAS TOWED FROM RUNWAY. AIRCRAFT WAS GROUNDED BY MAINTENANCE. T/S & FOUND HYDRAULIC LINE IN RT WHEEL WELL CRACKED FOR SLAT SYSTEM AT S846 PRESS SW. REMOVED AND REPLACED LINE. INSTALLED TEMP "FLEX" LINE, IAW AMM 20-10-09. OPERATIONS & LEAK CHECKS OK. SERVICED CENTER HYDRAULIC SYSTEM, IAW AMM 12-12-01. AIRCRAFT RELEASED FOR FLIGHT.