What was found
WHILE CHECKING ELEVATOR TRIM WE FOUND INTERMITENT BINDING OF ELEVATOR TRIM WHEN MANUALLY OPERATING TO NOSE DOWN DIRECTION. BINDING WAS OF SUCH THAT IT WOULD MOMENTARILY HANG BEFORE RELEASING. IT OCCURED AT PRETY MUCH THE SAME POSITION EACH TIME, (WHEN MOVING FROM 6 TO 3 ON THE ELEVATOR TRIM WHEEL). HEARD POPPING IN FLOOR UNDER SEAT 8A. REMOVED SEAT AND FLOOR PANELS AND FOUND ELEVATOR TRIM CABLE TURN BARREL HANGING UP ON THE ABOVE REFERENCED GUIDE TUBE. REMOVED AND REPLACED GUIDE TUBE RESET CABLE TENSIONS AND SAFTIED TURN BARREL. OPERATIONALLY CHECKED SATISFACTORY.