After receiving the email, I scheduled a service appt, as the email from Tesla asked me to. They just called and cancelled my appt. The service center said they do not yet know how to undo the SR regression, and they also don't know what to charge me even if they did know how. They did say they expect an appt is not required, and this can likely be done OTA.
Really not trying to complain, just wanting to provide info to others. I really enjoy the car and I got way more than I paid for...as a $35k SR buyer and an SR+/ leather interior receiver.
As for the promised call back from the Tesla sales center I visited in person Friday to ask the price for this upgrade, they haven't called back. In their defense, I'm sure they haven't called because they don't have an answer yet for what this will cost.