What was found
ACFT RETURN TO DEPARTURE DUE TO ACFT VIBRATION INFLIGHT, ACFT VIBRATION REPORT SURVEY COMPLETED IAW TSM 05-50-00-810-801-A, FOUND LT ELEVATOR SERVO CONTROL34CE1, LEAKING AT PISTON AND FAILED THE BACKLASH CHECK. R & R LT INBD ELEVATOR SERVO CONTROL IAW AMM 27-34-51. OPS CHECKED GOOD.