Bernina Record 730 Sewing Machine?

There's a short piece of thread stuck above the bobbin holder, I have no manual, so how do I remove it? I have removed the bobbin.

Also, it seems to be just doing really tiny stitches, how do I make them longer?

Also, it doesn't seem to go along as you sew, it sits in one place and sews unless I manually pull the material through. Any ideas?

This machine has recently been serviced and had a couple of new parts put in, one of which was the bobbin holder.