What was found
WHEN PUSHING CONTROL COLUMN FORWARD THERE IS HEAVY VIBRATION/BINDING. ALSO INTERMITTENT POPPING. REMOVED FROM SERVICE. COMPLIED WITH MCN E270006 ISSUE 01. NO FAULT CODES DISPLAYED ON EICAS. CONTROL COLUMNS MOVE WITHOUT BINDING. PERFORMED GVI OF CTRL COLUMN TORQUE TUBE & ASSOCIATED COMPONENTS IN FWD-AFT MOTION, NO DEFECTS NOTED. VERIFIED CTRL COLUMN DAMPERS INDICATED FULL WITH REF E175 AMM 27-31-02-210-801-A. NO DEFECTS NOTED, AIRCRAFT IS SERVICEABLE FOR CONTINUED SERVICE. COULD NOT DUPLICATE. NO PARTS REPLACED.