What was found
AIRCRAFT WAS GROUNDED: INFLIGHT GOT ECAM:,HYD Y RSVR LO LVL, HYD Y ENG 2 PUMP LO PR, HYD Y SYS LO PR. EMERGENCY DECLARED LANDED WITHOUT INCIDENT BUT HAD TO BE TOWED OFF RUNWAY, NO NWS. MAINTENANCE REPLACED #1 ENGINE EDP REF AMM 29-13-51.