As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - INFLIGHT T2154/21 NUMBER 2 ENGINE HYDRAULIC LOW PRESSURE LIGHT CAME ON DURING CRUISE. SHORTLY AFTER LOST ALL OF SYSTEM B-HYDRAULIC PRESSURE. DECLARED EMERGENCY AND LANDED AT DFW WITHOUT INCIDENT. REPLACED RIGHT HAND ENGINE HYDRAULIC PUMP AND FILTER. SYSTEM GROUND CHECKED NORMAL OPERATION.