As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS ON TAXI HYD QTY LOW C ON EICAS. CENTER QTY TO 0. NOSE STEERING LOST. MAINTENANCE REPORTS CENTER SYSTEM HYDRAULIC PUMP 1 CATASTROPHIC FAILURE OF UNION TO PRESSURE SUPPLY HOSE. REMOVED AND REPLACED CENTER SYSTEM HYDRAULIC PUMP 1. OPS AND LEAK CHECKS GOOD.