I can see this becoming a well-bookmarked thread. Lots of good advice and answers happening here! Even though I might not have a question right now, this will be the first place I look if something comes up.
I sent a question to Janome about my machine and the reply came back that they don't diagnose over the internet and I should take it in. They did tell me where to put a drop of oil, though. Luckily, I have a superb mechanic within driving distance and reliable machinery.