Apogee does not have any type of loaner units or advanced replacements available.
As we are a manufacturer and not a rental facility we don't have the type of used stock of all the products we've ever made that would make it possible to provide loaners for customers. We certainly empathize with your situation, and all our customers who need repairs, as most all of our customers are professional audio engineers and sound facilities, so we do get this question a lot.
If you are studio owner or facility in need of a loaner during a time of repair the best method is to contact a local gear rental facility. Here is a non-comprehensive list of rental houses in major metropolitan areas: RMA: Where can I rent Apogee gear?