What was found
PDX-ON FLIGHT 2228, RETURNED TO GATE. AFTER PUSHBACK AND WHEN PARKING BRAKE WAS RELEASED NR 1 HYDRAULIC PUMP CAUTION ILLUMINATED. NR 1 HYDRAULIC QUANTITY WENT TO ZERO. THE HYDRAULIC FLUID LEAKING ALL OVER NR 2 MAIN GEAR. MAINTENANCE INSPECTED NR 2 WHEEL WELL AREA AND FOUND HYDRAULIC LINE BETWEEN ANIT-SKID VALVE AND QUANTITY LIMITING VALVE CRACKED. REMOVED AND REPLACED NEW FABRICATED HYDRAULIC LINE. PRESSURIZED NR 1 SYSTEM. NO LEAKS NOTED. AIRCRAFT RETURNED TO SERVICE.