We're not going to walk you through replacing a torsion spring yourself. These springs sit under enough tension to break a bone or worse if the winding bar slips, and the tools for it - proper winding bars, vise grips rated for the clamp, a ladder tall enough to clear a 7-foot door safely - aren't things most Saginaw garages have sitting in a drawer. If you're the type who's already pulled the panel off the opener housing to look, fine, but stop there. What you CAN safely check yourself: whether the cables are still seated in the drum, whether the spring itself is visibly separated (a clean gap in the coil, usually near the center bracket), and whether both springs on a double-spring door are intact or just one. That tells you what you're dealing with before you call, which saves time on the phone. Beyond that, leave the bar in the garage. A spring that lets go while someone is unwinding it wrong is the single most common ER trip tied to garage doors, and it's entirely avoidable.