Quilt member whose tnread is breaking on her Bernina: Use a 90/14 topstitch needle, check you tension, and thread path for areas where the thread can hang up. Try Aurifil 50 or 40 wt......let us know if the needle change works......I agree, get another dealer/repair person.

Folks not liking their sergers have not posted the brand.....I love all of my Babylock sergers.....all self threading.