IBM IntelliStation Z Pro Type 6866 User Manual page 74

To remove the cover and front bezel:
1. If the key-lock button is locked, unlock it.
2. Press the key-lock button on the left side of the front bezel and slide
the side cover toward the rear of the computer.
3. Lift the side cover from the computer.
4. Lift the lever at the top of the chassis and pull the front bezel from the
front of the computer.
Attention
Proper cooling is required for the reliable performance of internal
components. Do not operate your computer with the cover removed.
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IntelliStation Z Pro User Guide