As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2294: DURING AFTER START FLOW, FO REPORTS NR 3 HYD PRESSURE DROPS BELOW 1000 PSI DURING CONTROL CHECK. AIRCRAFT RETURNED TO BLOCK. MAINTENANCE BLED THE NR 3 HYDRAULIC SYSTEMS IAW AMM TASK 29-10-00-870-803. PERFORMED OPERATIONAL TEST OF THE NR 3 HYDRAULIC SYSTEM IAW TASK 29-12-01-710-801. OPS CHECK GOOD. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.