SONOS does not offer any repair services. There are some 3rd party repair services in Europe, but none that I’m aware of in the US. My suggestion would be to purchase a non functional “for parts only” FIVE, and follow one of the many D.I.Y. (Do it yourself) repair videos showing disassembly and reassembly of a FIVE. If D.I.Y. is not something that you are comfortable with, perhaps a kid, friend, or local repair shop would welcome the challenge.
If your FIVE is still functional, you don’t need to become involved with any electronics trouble shooting, just swap the body parts. Take care to avoid physically distorting the WiFi antennae.