I have taken a look at my SL-C3000, it has the 561633F chips in it, but I haven't any access to a shop that could replace it. I don't know of anyone in the US doing this. If any of you know anyone who does this, or who might be talked into doing this, well, I'd sure appreciate it if you'd let me know about them or maybe give them my email address. With all the spam I get, it'd be a lot more reliable to give me their name.
I know I couldn't do the swapout myself, darn it. I used to be a pretty good solderer, but that's ancient news.