As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 5810 DURING TAKEOFF ROLL AT 125 KNOTS WE FELT A QUICK (1 SEC) SHUDDER . IN THE YAW AXIS. ENGINE INDICATION NORMAL. SEA TWR SAW NO EVIDENCE OF TIRE FAILURE. FLIGHT WAS NORMAL. DECLARED EMERGENCY. CORRECTIVE ACTION: OPENED GEAR DOOR AND LOWERED FLAPS TO 30 DEGRESS. PERFORMED VISUAL INSP OF NOSE STEERING MECHANISM NO DEFECT NOTED. INSPECTED ALL TIRES PER B757-200 AMM 32-45.