Lenovo ThinkCentre M77 Hardware Maintenance Manual page 127

3. Remove the front bezel by releasing the three plastic tabs on the top of the front bezel and pivoting the
front bezel outward to remove it from the computer.
Figure 53. Removing the front bezel
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Chapter 9 Replacing FRUs (Machine Types: 1996, 1997, 2002, 2010, 2208, 2209, 2221, 2224, 2226, and 2227.)