What was found
EN ROUTE, RECEIVED ECAM MESSAGE YELLOW HYDRAULIC PUMP LOW PRESSURE, DIVERTED TO PHX FOR REPAIR. MAINTENANCE REMOVED AND REPLACED THE NR 2 (YELLOW) ENGINE DRIVEN HYDRAULIC PUMP IAW AMM 29-13-51-04, OPERATIONAL CHECK AND LEAK CHECK WAS GOOD. CONFIRMED FAILURE OF ENGINE DRIVEN HYDRAULIC PUMP S/N MX635336. UNIT WAS DISASSEMBLED AND NUMEROUS SEALS WERE FOUND WORN BEYOND LIMITS. REPLACED 32 SEALS/PACKINGS AND TESTED UNIT IAW CMM 29-11-34, REV. 4.