What was found
FLT#2836, LAX-SFO. (AIRCRAFT DECLARED AN EMERGENCY INTO SFO) ' HYD Y RSVR LO LVL ECAM; FOUND PINCHED O-RING ON PUT MANIFOLD, REPLACED O-RING PER AMM 29-13-15. PERFORMED OPS CHECK NO LEAKS NOTED, OK FOR SVC, REPLACED HYD LOW & HIGH FILITERS, OPS CK GOOD, NO LEAKS NOTED.'