As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD/SGE - FLT 7621 - DURING CRUISE, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO NR 1 HYDRAULIC SYSTEM FAILURE. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE REMOVED AND REPLACED FLEXIBLE PRESSURE LINE, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)