I will inspect and clean that area again. It's hard for me to see that area clearly so perhaps I missed something. The machine is in a cabinet so I can't lay it completely flat on it's back to look underneath plus the lighting in that room isn't the best. I'll inspect it again with a flashlight today.
A question about the feed dogs. I'm doing FMQ. I'm pretty sure the feed dogs on this machine are completely disengaged when I drop them, not sure about all machines. Could they still squeak even if they are disengaged?
Thanks for your help!! You have this machine correct? Gosh, how annoying is the bobbin area on this machine? Like when you have to disassemble it to clean it. I find it tricky getting the shuttle hook cover back in place properly.