On a house built around 1993, the spring itself usually isn't the only thing that's tired. Cable fraying at the drum, dry-rotted rollers, and a center bracket that's loosened over three decades of cycling all show up around the same time as spring failure, because they've all been running the same number of open-close cycles since the house was new.
One limitation worth being upfront about: if the door has taken enough cycles that the track is bent or the bottom panel has separated from age, a spring alone won't fix the ride, and we'll tell you when replacement makes more sense than another repair. We're not going to sell you a spring job on a door that needs to be replaced outright.