We work on residential garage doors and openers: torsion and extension springs, cables, rollers, tracks, panels, and the usual opener brands homeowners install. That's the job.
We don't do commercial overhead doors, rolling steel doors, or fire-rated doors, that's a different trade with different hardware entirely. We also don't recommend repairing a door where the frame itself has shifted from foundation settling. At that point, the door isn't the problem, and spending money on springs or tracks won't fix a frame that's out of square. We'll say so rather than sell you a repair that won't hold.