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The serial number label is located on the side of the PSM (see Figure 1, Figure 2) and Figure 3.
Replacing an MX2000 AC Power Supply Module
Replacing an MX2020 DC Power Supply Module (-48 V)
Replacing an MX2000 DC Power Supply Module (240 V China)
Displaying MX2020 Router Components and Serial Numbers
Contacting Customer Support
How to Return a Hardware Component to Juniper Networks, Inc.
Guidelines for Packing Hardware Components for Shipment