Just spoke with the local SC here and Tesla Ownership. The update is just a new set of fuses for the existing HPWC itself that are less sensitive, my guess slow-blow or less temp sensitive. They are having Rangers come out and swap out the fuses in some instances, it is a 5-10 minute job. So no worries about replacing the entire HPWC, it is just an updated set of fuses. I would contact your local service center and have them put a set of the updated fuses on order. Then the next part is if you can actually swap them yourself.
If you don't feel comfortable for example changing an outlet, I would not attempt it, ask your SC if they can just send out a Ranger to swap the fuses.
If you can handle an outlet change, tell the service center you are just going to have your electrician do it and your will pickup the fuses, then do it yourself, it is pretty straight forward.
1. Turn off power
2. Ensure power is off, no green light on the hpwc.
3. Use Torx bit and open case to HPWC, carefully remove cover and ribbon cable.
4. Use appropriate socket and remove fuses (I think they are 3/8 of maybe 7/16 socket).
5. Keep the old fuses so you can reinstall if thing go badly.
6. Put in new fuses in, tighten to proper torque spec.
7. Reconnect ribbon cable, replace cover.
8. Turn on breaker test operation at 80 amps and see what happens.
Something else that is interesting, the HPWC installation guide online has illustrations/pictures of the inside of the HPWC and it doesn't show any fuses between the wiring blocks and the contactor, it just looks like bars.
All of the other EVSE's I have ever had didn't have any fuses in them, they just had regular wires from the wiring block to the contactor.
