As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6414 - IAD-GSO - DURING CRUISE, MADE AN UNSCHEDULED LANDING DUE TO LEFT AND RIGHT HYDRAULIC PRESSURE FLUCTUATION. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED HYDRAULIC PRESSURE GAUGE, OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (M)