As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INBOUND TO MDW A/C WAS DIVERTED TO ORD DUE TO THE NR 2 B SYSTEM PUMP LOW PRESSURE LIGHT CAME ON AND THE B SYSTEM QTY DROPPED. THE NR 1 B SYSTEM PUMP LOW PRESSURE LIGHT CAME ON AND THE PILOT LOST ALL THE B SYSTEM PRESSURE. A/C WAS TOWED TO GATE AFTER LANDING. THE B SYSTEM WAS FOUND WITH A BROKEN HYDRAULIC LINE AT THE FERRULE GOING INTO THE MODULAR UNIT. THE TUBE WAS REPLACED PER MM 29-12-0. CHECKED FOR LEAKS AND CHECKED OK. (M)