Lenovo ThinkCentre 3026 Maintenance Instructions Manual page 89

6. Press the cover-release button on the side of the computer and slide the cover
to the rear of the computer to remove the cover.
Figure 3. Removing the computer cover
Chapter 8. Replacing FRUs (Machine Types: 3029, 3054, 3139, 3219, 3246, 3282, 3349, 3421, 3544, 3652, 3769, 3934, 4992, 5206, 5267,
83
5325, 5384, 5450, 5474, 5498, 5554, 5852, 6232, and 6590.)