Off topic: In my last post I mentioned replacing the 12V battery. I did that yesterday, here is an image. Nothing is ever straight forward, the terminal screws are M6, the original lead acid used what look like M5 screws so rather than modify the terminal adaptors (more involved than just drilling out those holes to 6mm) I turned up a couple of new brass ones. Both batteries have the same footprint but the new one is 11mm taller and because the terminal polarity is reversed they end up further forward. Old battery 33Ah, new battery claims 40Ah. The frunk bucket still fits which is a relief. New battery cost $450 AUD.
On topic: eMMC fail symptoms still persist (no surprise there). If Tesla did the fix would the replaced MCU still have an 8GB chip or are Tesla using 16GB chips these days ?
Off topic: With the frunk bucket out I noticed the AC condensate hose was dirrecting water onto the floor of the frunk (the glued on P clip had detached) so today's job is to re-plumb that to a better place (probably the right hand wheel arch).