As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6466 - PHF-IAD - MADE AN UNSCHEDULED LANDING DUE TO RIGHT HYD PRESSURE DROPPED TO ZERO. AIRCRAFT RETURNED TO GATE AT PHF WITH NO FURTHER PROBLEMS. MX INSPECTED AND REMOVED AND REPLACED PRESSURE TRANSMITTER, OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (M)