Apr. 10, Las Vegas, Nev. / Boeing 737-300

At 13:17 PDT, a United Airlines Boeing 737-300 aborted its takeoff roll because of an uncommanded yaw as the airplane accelerated through 120-130 knots. The yaw coupler was replaced and the aircraft continued on to its original destination. After the aircraft landed at Los Angeles, a company mechanic noticed that the nose gear made an unusual bump and rattle during turning while the aircraft was being taxied to the hanger. The aircraft was ferried to the companys maintenance base and the nose landing gear trunnion bearings were replaced.