The problem was a broken heating element wire. Luckily, a crimp terminal fixed it. You don’t want to solder toaster wire. It gets hot in operation and you don’t really want to drip molten lead ...
Every toaster comes with a one-year warranty and two years on the heating elements. After that, should any part wear out, Dualit will fix it, for a cost. If you look online, you'll find ...