What was found
SEA - SLIGHT VIBRATION IN CAPT CONTROL YOKE ON TAKEOFF. GOES AWAY AT 145KTS. COULD NOT DUPLICATE AT ALTITUDE OR ON LANDING. PERFORMED TWO SIMULATED TAKEOFFS AT ALTITUDE. FERRIED TO PDX FOR REPAIRS. JACKED LT AND RT MAIN LANDING GEAR AXELS, INSPECTED ALL FOUR MAIN TIRE ASSEMBLIES AND BRAKES FOR ANY BINDING OR DEFECTS, NONE NOTED. INSPECTED MAIN LANDING GEAR DOORS, FAIRINGS AND STRUT ASSEMBLIES FOR DEFECTS, NONE NOTED. RT INBOARD AND LT OUTBOARD SPOILER TOGGLE LINKS REPLACED AND LT ELEVATOR OUTER MIDDLE BEARING AND RT INBOARD AND OUTBOARD MIDDLE BEARINGS REPLACED. CHECK FLIGHT GOOD. RETURNED TO SERVICE.