What was found
PIT - FLT 1025 - AFTER TAKEOFF, THE CREW GOT A 'HYD SYS 2 LO QTY' ALERT. ACFT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND PRESSURE LINE 'B' NUT ON UPPER PUMP LOOSE AT QUICK DISCONNECT. MAINTENANCE TIGHTENED FITTING. SERVICED, RAN ENGINE, ALL OPERATIONS NORMAL. (W)