From the TAC's reply it appears the replacement has been approved already and your new unit will be sent shortly. Your RMA coverage does not cover weekends, however, so the replacement is sent from a business-week depot.
as @FJU-ITCS mentions, you could set up an HA cluster to protect yourself from outages in case one of your devices fails
you can purchase a new unit through your local sales contact : https://www.paloaltonetworks.com/company/contact-sales
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