What was found
AIRCRAFT RETURNED TO PLATFORM DUE TO DURING FLIGHT CONTROL TEST, WHEN PUSHING THE CONTROL COLUMN FORWARD, VIBRATION WAS FELT IN THE WHOLE AIRCRAFT. DURING CHECK LOAD FEEL, DAMPER, ELEVATOR VALVE, CYLINDER ELEVATOR AND HORIZONTAL STABILIZER MANIFOLD WERE REPLACED IAW MM 27-30-01, 27-30-05, 27-30-07, 27-30-08 AND 27-30-10, TESTED CORRECT.