Solution
The PXIe-1085 Chassis has a power supply which can be removed and replaced. This power supply Part Number is 153663X-01 where X represents the Hardware Revision. Power supplies with Revision C and later are interchangeable. Earlier versions of the power supply have a physically different connection and will not fit inside newer chassis and vice versa.
The PXIe-1085 Chassis also has a power supply shuttle. The power supply shuttle cannot be purchased separately and needs to be repaired in an authorized repair center. For support and repair, the Part Number and Serial Number of the main chassis body and the power supply shuttle need to match. Interchanging the power supply shuttles and chassis bodies is known to work in some cases, but this is considered an unsupported configuration. The MAC address of the entire chassis is tied to the power supply shuttle.
For more information about removing and replacing the power supply see Page 3-3 of the PXIe-1085 Series User Manual.