1) You’ll get an email *either way*, telling you whether you need the fix or are already good, or you’ll find the TSC number on a prior invoice. Many of us have already received the email.
2) The TSC is replacing a piece of tape near, not on, the woofers in the front footwells. There is a sound hole that needs covering up due to the way in which the sound travels. Trivial fix. Once that is done, 2.5.0 has completely redesigned speakers and audio tuning, that works (and is only activated) post-TSC.
*Even if* you previously had the TSB applied with a *different* piece of tape, this is not that. I know it sounds crazy, but crazier things have been discovered before; it makes a massive difference, along with the new tuning.
Everyone please read this comment, or refer to it, so we don’t end up repeating ourselves a bunch of times please.