What was found
CREW REPORTED AT FL250 GOT ECAM HYD Y RSVR LO LEVEL. CREW FOLLOWED QRH AND SHUT OFF ENG PUMP. QTY WAS SHOWING ZERO. CREW TURNED Y ENG PUMP BACK ON FOR LANDING. CREW REPORTED HYD FLUID RESIDUE BETWEEN BOTH MLG WHEEL WELLS. UPDATED MAA CODE FIX USING VENDOR MAA SCREEN PLEASE CONTACT TOMC BEFORE COMMENCING ANY WORK. FOUND YELLOW SYS GROUND LEAKAGE MEASURMENT MANIFOLD LEAKING. REMOVED AND REPLACED MANIFOLD IAW AMM 29-19-41. NO LEAKS NOTED AT THIS TIME. OPS CHECK GOOD.