As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2400 ON CLIMB-OUT OF SEA, NOTICED NR 1 MAIN HYDRAULIC PRESSURE 0. NO CAUTION LIGHTS. WHEN STANDBY PUMPS ON NR 1 MAIN HYDRAULIC INITIALLY CAME UP THEN BLED TO 0. ON DESCENT AND LANDING ALL INDICATION NORMAL. MAINTENANCE REPLACED HYDRAULIC PRESSURE TRANSMITTER. GROUND RAN AIRCRAFT. PRESSURIZED HYDRAULIC SYSTEM. OPERATED FLIGHT CONTROLS NO DEFECT NOTED. LEAK CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.