As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2138, AFTER STARTING OUR TAXI OUT TO RUNWAY, NOTICED THE NR 2 HYDRAULIC QUANTITY WAS SLOWLY DEPLETING. STARTING AT 3.5 QUARTS ALL THE WAY DOWN TO ZERO. TROUBLESHOT TO BROKEN LINE AT INLET OF PART BRAKE ACCUMULATOR CHECK VALVE. REPLACED HYDRAULIC LINE. SERVICED NR 2 HYDRAULIC SYSTEM. BLED NR 2 HYDRAULIC SYSTEM. LEAK CHECK GOOD. NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.