As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - AIRCRAFT HAD AN UNCOMMANDED YAW ON TAKE-OFF ROLL. TAKEOFF AND LANDING WERE UNEVENTFUL. MAINTENANCE INSPECTED THE AIRCRAFT AND REPLACED THE HYDRAULIC POWER UNIT. OPERATIONAL AND FUNCTIONAL CHECKS WERE GOOD. AIRCRAFT RETURNED TO SERVICE.