Did the hybrid control module updates say what they were for? Or were supposed to fix?I had some time today, so I went ahead and did this. It really isn't very hard if you have some basic computer knowledge and can follow directions. I used a Mongoose OBDII adapter that I already had for other cars, so I'm not sure how well it would work with cheaper cables. I was able to update the software for the A/C train noise and the ESC recall in about 15 minutes. Not sure why these updates take hours at the dealer. I also noticed that there were updates available for the Hybrid Control Module, so I did those too. The subscription gives full access to Techstream and TIS, and all of the documents in TIS seem to able to be saved as pdfs for offline viewing.
In case anyone wants it, here's the real pdf for the train horn noise (T-SB-0042-22):