A door built in 1976 has had close to fifty years of open-close cycles on original or once-replaced hardware, and extension springs typically don't last that long without at least one failure. The mild temperate climate here is easy on doors compared to freeze-thaw regions, so rust and cold-snap cable snapping aren't the main culprits. What we see instead is fatigue: springs that have simply cycled past their rated life, rollers worn oval instead of round, and track brackets loosened by decades of vibration rather than storm damage. Because Rainbow's housing stock skews older than the broader service area's 1975-2009 range, a lot of these doors are on the early end of that window, meaning original steel is more likely and universal replacement springs are less likely to be a straight swap. Household income here runs close to the wider area's, but a bit under the region's $88,879 median, which is worth mentioning only because it shapes which repairs are worth doing versus which doors have earned a full replacement instead of another patch.