System service parts (Tower Form Factor) - ThinkCentre M90 (type 3029, 3139, 3246, 3349, 3544, 5474, 5554, 5384, 6232, M90p (type 3054, 3219, 3282, 3421, 3652, 5498, 5852, 5450, 6590) - Lenovo Support GB