No, they are not soldered to the logic board, but they are proprietary Apple parts, maybe someone will make replacements, but I wouldn't hold my breath.
No. They are part of the logic board and specifically designed by Apple and not available in the open market for Jane and Joe. At least not yet.
MRoogle is a good tool to search these fora for already existing threads about questions you have. It might be able to answer you quicker than creating a thr