As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6578 - IAD-PWM - DURING CRUISE, A/C MADE AN UNSCHEDULED LANDING DUE TO LOSS OF HYDRAULIC QTY. AIRCRAFT DIVERTED TO BOS AND WENT TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND FOUND BROKEN HYDRAULIC FILTER FITTING TO THE STEERING SELECTOR. MAINTENANCE REMOVED AND REPLACED FITTING AND SERVICED HYDRAULIC SYSTEM, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)