Lenovo ThinkCentre M91p User Manual page 78

3. Remove the front bezel by releasing the three plastic tabs and pivoting the front bezel outward.
Figure 48. Removing the front bezel
4. Locate the internal speaker. See "Locating components" on page 11.
5. Disconnect the internal speaker cable from the internal speaker connector on the system board. See
"Locating parts on the system board" on page 12.
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ThinkCentre User Guide