some part is available at retail , sear parts department, Home depot. But some part only sell to pro since it is not safe to DIY install.
So which parts is broken.
home depot has steel wire for sale. But you better take the old cable with you to buy it. Because the thickness must be the same. If the broken part is at end of cable at bottom of the door. Then you could buy a short piece of cable and few connectors.You could replace only broken part.
