All protosound 2 (3 or 5 volt) boards have a Protosound32 upgrade kit available to them. This part essentially upgrades them to Protosound 3. I really haven't had any problems with the PS3 stuff yet nor have had to make any repairs to them due to electronics failure. the PS3 upgrades kits are by far much easier to install and provide many more features than the previous PS2 upgrade kits.
Uhh... that's not true! The electrics with the operating pantographs, or things like the Coors Silver Bullet train need a special board and the PS32 board has yet to be upgraded to support those. That comes from MTH a few days ago as I have one of these in for a board replacement.