What was found
B-SYSTEM BOTH LOW PRESSURE LIGHTS ILLUMINATED AT START OF TAKEOFF ROLL. PRESS DROPPED 200 LBS. OPENED BRAKE INTERCONNECT A-SYSTEM DROPPED TO 1 GALLON INTERCONNECT. REMOVED AND REPLACED HYDRAULIC PRESSURE LINE NR 2 B-PUMP REF M/M 20-10-12, NO LEAKS NOTED. P/N: 171141-8CR0360. RTO, NO AIRSPEED, HAD JUST MOVED TRUST LEVER FORWARD WT: 136,620, NO AIRSPEED, -1C, AND PRESS ALTITUDE 5,000 FT. NOT REQUIRED DUE TO NO AIRSPEED IAW M/M 5-51-121.