The fault we see most in Berwyn isn't a worn-out spring giving a slow, gradual warning. It's a sudden snap on a door that was working fine an hour before, because the spring wound down decades ago and simply reached its cycle limit. Berwyn's housing stock has a median build year of 1938, well ahead of the 1963 median across the rest of the Skokie Garage Door Pros service area covered under F1. A garage built in the late 1930s was very often a single-car detached structure added after the house, with a door and spring setup sized for that smaller, lighter panel.
That matters because a lot of these garages have been reworked over the years - a heavier steel door swapped in where a wood one used to hang, sometimes without upgrading the spring to match the new weight. When that happens, the spring is undersized for the door it's lifting, and it wears out faster than it should. We open the door, we don't guess from the curb. If the spring looks original to a 1938 build but the door clearly isn't, that mismatch is usually the real story.