What was found
FLT#794, AUS-JFK. 'PREVIOUS CREW STATED AIRCRAFT VIBRATION DURING CLIMB AND THEN DISIPATED. COMING FROM TAIL AREA. AIRCRAFT TEST FLIGHT DOES NOT SPECIFY VIBRATION PRESENT; REF TSI F/CTL ELEV SERVO FAULT- REMOVED AND REPLACED LH SIDE G ELEV SERVO VALVE 34CE1 IAW AMM 27-34-51. LEAK AND OPS CHECK C/W, ALL GOOD.'