What was found
CLIMBING THROUGH FL 358 A CONTINUOUS & CONSTANT FLIGHT CONTROL VIBRATION WAS FELT THROUGH THE FLIGHT CONTROL COLUMN. THE VIBRATION WAS ONLY FELT ALONG THE HORIZONTAL STABILIZER AXIS. OCCASIONALLY THERE WAS A STRONGER VIBRATION PERIODICALLY FELT. THE VIBRATION CONTINUED AT CRUISE FLIGHT AT FL 370 & DURING DESCENT. WITH SLOWER AIRSPEED THE VIBRATION LESSENED IN THE DESCENT & BELOW 10,000 THE V. VIBRATION DETAIL VISUAL INSPECTION IAW WC 12-200-01. NO DEFECTS NOTED AT THIS TIME.