What was found
AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. ORD-DFW FLIGHT DIVERTED TO STL ACCOUNT RIGHT ENGINE SHUTDOWN IN FLIGHT. JUST PRIOR TO LEVEL OFF AT FL220, THE RIGHT NR 2 HYDRAULIC ENGINE PUMP LOW PRESSURE LIGHT ILLUMINATED. AFTER ABOUT 5 MINUTES, "B" SYSTEM QUANTITY DROPPED TO ZERO, "A" SYSTEM STAYED AT 71. ELECTRIC HYDRAULIC PUMP LIGHT AND ENGINE NR 2 OIL FILTER BYPASS LIGHT ILLUMINATED. UNEVENTFUL LANDING WITH SINGLE ENGINE. REMOVED AND REPLACED RIGHT ENGINE DRIVEN PUMP WITH ENGINE CHANGE PER AMM 29-11-11 AND 71-94-01 (AALA20171030006), SYSTEM B ELECTRIC MOTOR DRIVEN PUMP PER AMM 29-11-21 (AALA201711079014), AND STANDBY HYDRAULIC SYSTEM EMDP PER AMM 29-21-21. OPERATIONAL CHECK GOOD.