As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB THE CREW REPORTED A LOUD BANG ACCOMPANIED BY COMPLETE LOSS YELLOW HYDRAULIC SYSTEM QUANTITY. AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. MAINTENANCE FOUND THE NR 2 ENGINE THRUST REVERSER HYDRAULIC PRESSURE LINE CHAFED AND LEAKING. REMOVED AND REPLACED LINE IAW AMM 29-13-49. SYSTEM CHECKS NORMAL.