As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW INFLIGHT. RIGHT HYDRAULIC QUANTITY WENT TO ZERO ALONG WITH HYDRAULIC PRESSURE TO 1500 PSI WHEN SLATS WERE EXTENDED ON FINAL APPROACH. LANDING WAS NORMAL EXCEPT FOR DRAGGING DOORS ON LANDING. FOUND RIGHT SHUT OFF VALVE LEAKING. REPLACED GROUND SPOILER CONTROL VALVE.