Brother Super Galaxie 3000

[Big Red Bird]

Brand new member here!

I've had my fabulous machine for over 3 years and not had any real problems with it. Now, for some reason, the sewing fabric doesn't feed 'straight' anymore - it seems to veer off to the left. I made some huge voile curtains a couple of months back and they were a right pain to do as they just refused to stay still and I couldn't get any speed up! It was exhausting!

I have a feeling it is something to do with the feed dogs(?) but I dread to think where I might have to take it to be repaired here! I'm hoping it is just something I'm doing wrong.

If anyone could shed some light on this it would be great. Thanks!