Repair it or replace it?
Replace when sections are dented, split, rusted through at the bottom, or the door has gone out of square, and when repairs have started stacking up. Repair when the door is straight and the failure is a wear part. The test that cuts through it: what does the repair buy you in years, and what is that per year against the cost of the new door? Ask for both numbers. A company that will only quote you the replacement on a door that still runs straight is telling you something.
