Oracle SPARC T8-4 Service Manual page 101

If you have removed the main module to service an internal component,
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remove the cover from the main module.
Press the green button near the front edge of the cover and slide the cover back and up off
the main module.
10. Determine your next step.
If you are replacing a main module due to a faulty motherboard, remove all
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of the internal components, and transfer them to the new main module.
If you are replacing a component inside the main module, use one of the
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following links:
"Servicing the SPM" on page 117
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"Servicing the Battery" on page 129
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Remove the Main Module
Servicing the Main Module 101