Lenovo ThinkStation P520 Hardware Maintenance Manual page 192

5. Lift the clip on the rear of the flex module, and then slide the flex module cover to the rear of the flex
module.
Figure 148. Removing the flex module cover
6. To remove a four-digit diagnostics display, press the two clips toward each other and push forward the
four-digit diagnostics display. Then, pull the four-digit diagnostics display out of the flex module.
Figure 149. Removing the four-digit diagnostics display
7. To install a four-digit diagnostics display, do the following:
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P520 Hardware Maintenance Manual