What was found
AFTER TAKEOFF, CREW REPORTED A VERY PRONOUNCED SIDE TO SIDE VIBRATION, YAW DAMPER WAS THEN TURNED OFF, NO HELP. DIVERTED TO PHX AND MADE AN UNEVENTFUL LANDING. REPLACED RUDDER PCU AND YAW DAMPER COUPLING AS A PRECAUTION PER BOEING M/M. AFTER FURTHER TROUBLESHOOTING AND TEST FLIGHTS, DURING GROUND GEAR RETRACTION TEST, FOUND NOSE GEAR AND LEFT MAIN GEAR DOORS OUT OF ADJUSTMENT.