Torsion springs are the kind wound-up on a rod above the garage door opening.
When one breaks the other often follows, so save the cost of another service call, and have both replaced when one breaks. Many people have been maimed or killed tightening or releasing these springs. Hire a professional. They look something like long handled bolt cutters but, the business end it a ratchet to hold the bar as you tension the spring. Skydiving is much safer.