I bought this a few years ago and it was working fine, but the other day it started going in reverse only, even when the reverse stitch lever wasn't pressed. The manufacturer said it would cost about as much as buying a new one to repair it, so is there anyone who can repair it themselves? It looks clean with no scratches or stains. Electric sewing machine SN1851, black, with foot pedal, instruction manual included. - Model: SN1851 - Accessories: Instruction manual, foot pedal - Color: Black Thank you for looking.