What was found
PHX/IAH - FLT 0276 - AIR TURNBACK. ENCOUNTERED HIGH SPEED VIBRATION THROUGH RUDDER PEDALS SHORTLY AFTER LIFT OFF AND CONTINUED THROUGH CRUISE. REMOVED AND REPLACED LEFT AND RIGHT ELEVATOR TRIM TABS. TEST FLIGHT SATISFACTORY, NO VIBRATION NOTED. ACFT TT: 34,607 HRS. ACFT TC: 30,237. REFERENCE: OPERATOR CONTROL NR 96ZZZX3037. (X)