As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - FLT 2450 - DURING TAKEOFF ROLL, EXPERIENCED TWO SEVERE SIDE JOLTS ABOUT 4-5 SECONDS APART. PER QUALITY CONTROL ALERT BULLETIN NR 95-15 PERFORMED RUDDER PCU LEAK CHECK IAW A8M27001, NO DEFECTS NOTED. PER MX CONTROL CHANGED YAW DAMPNER COUPLER IAW 22-11-141. (M)