As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#2475, BDL-SJU. (AIRCRAFT DECALRED AN EMERGENCY INTO SJU) ' HYD Y RSVR LVL ECAM: 45 MINUTES INTO FLIGHT C FL 340. FOLLOWED ECAM QRH. CONTACTED MCC; REMOVED AND REPLACED O-RING AT HALF COUPLING FIN# 3701GM IAW AMM 29-13-15. OPT CHECK OK. NO LEAK FOUND.'