As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 390 - EN ROUTE ORD-LGA, ABOUT 20 MINUTES INTO FLIGHT LOST ALL FLUID AT RIGHT SIDE HYDRAULIC SYSTEM. RETURNED ORD AND LANDED WITHOUT FURTHER INCIDENT. REPLACED LINE AT RIGHT SIDE HYDRAULIC ELECTRIC PUMP. SERVICED HYDRAULIC SYSTEM. LEAK CHECKS GOOD. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)