Lenovo ThinkStation PX Manual page 10

4. While looking at the right side of the system (under the motherboard), press the
release tabs to remove the blank bezel for front access bays 5 and/or 6
depending on how many U.2/U.3 storage enclosures to add.
5. Remove HDD fans for the front access bay 2+5 and/or 3+6 depending on how
many U.2/U.3 storage enclosures are to be added.
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