If the door is from the early 1980s and running on extension springs, we'd rather you not touch the springs yourself. Extension springs store less energy than torsion springs but they're also more likely to be undersized or missing a containment cable on an older install, and a spring letting go under tension has put people in the ER. Things you can safely check: the tracks for visible dents, the weatherstripping along the bottom for cracking, whether the opener's safety reversal still works by holding a 2x4 under the door as it closes. If the door reverses properly and the tracks look straight, you might just have a lubrication or alignment issue, both DIY-friendly. If the door is heavy to lift by hand with the opener disconnected, or it drops fast and uncontrolled, that's spring tension doing something it shouldn't, and that's a call-us job, not a weekend project.