[link|https://www.ifixit.com/User/3994555/Andr%C3%A9+Paquet|@brassens216] can’t get them from Bose so that is not an option. You can always check places like eBay or Craigslist and see if you can purchase a soundboard that has other issues and then harvest the board from that. Of course you also want to check if you possibly fix your control board, that would even be better.