What was found
PHX - VIB - FLT# 771 - ON CLIMB-OUT AT SPEEDS GREATER THAN 300KTS IAS, HAD LIGHT TO MODERATE AIRFRAME VIBRATION FELT BY ALL CREW MEMBERS. WENT AWAY LESS THAN 300 KTS. ALL ENG PARAMETERS NORMAL. ALL VIBRATION READINGS LESS THAN 1.0 EACH ALERT MOC AT 2150Z. MAINTENANCE REMOVED AND REPLACED ALL 3 RUDDER SERVO CONTROLS. ALL 3 FREEPLAY WITHIN LIMITS. M&E 26-2720-9-0001, S/N 3974, TT 24814, TC 9491, TSR 24810; S/N 3980, TT 24814, TC 9491, TSR 24810; S/N 3985, TT 24814, TC 9491, TSR 24810.