As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 629, ABOUT 1 HOUR INTO THE FLIGHT CAPTAIN CONTACTED DISPATCH THRU ACARS & ADVISED Y SYS HYD FAILURE. ACFT DIVERTED, WHERE EMER TRUCKS WERE STANDING BY. AN OVERWEIGHT LANDING WAS MADE. THE ACFT LANDED & TAXIED TO THE GATE WITH NO PROBLEM. FOUND A CHAFED HYD PRESS LINE ON THE NR 2 ENG. THE LINE WAS REPLACED & A SATISFACTORY OPERATIONAL & LEAK CHECK WAS ACCOMPLISHED IAW AMM 29-11-49.