IBM eserver xSeries 232 8668 Hardware Maintenance Manual page 54

Removing the cover (rack model)
4. Move the cover-release lever down while sliding the top cover toward the rear
This chapter provides instructions to add options to your server. Some
option-removal instructions are provided, in case you need to remove one option
to install another.
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Hardware Maintenance Manual: Type 8668
Note: When the server is in the locked position, you can reach the cables on
the back of the server.
of the server approximately 25 mm (1 inch). Lift the cover off the server and set
the cover aside.
Attention: For proper cooling and airflow, replace the cover before turning
on the server. Operating the server for extended periods of time (over 30
minutes) with the cover removed might damage server components.