My garage door has two springs on the inside, accross the top of the door under a cover. The spring hooked on the left is attached to a cable on the right which goes over a pulley down the right hand side on the door. And vise versa for the other spring. When one spring broke the other spring still helped to lift the door etc. It's a Garadoor Mk3
In my case the hooked bit on the end of the spring had snapped off and I was able to bend the next coil on the spring after heating with a blow lamp and hammering and put it back in !! Still ok after several years.
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