As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO IAD DUE TO THE YELLOW HYDRAULIC SYSTEM LOST ALL QUANTITY INFLIGHT. THE AIRCRAFT LANDED SAFELY AT IAD AND WAS TOWED TO THE GATE. MAINTENANCE FOUND THE HYDRAULIC FLEX LINE GOING TO THE HYDRAULIC PRESSURE TRANSDUCER RUPTURED ON THE #2 ENGINE, REPLACED THE FLEX LINE AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK.