Lenoir City's build year, centered on 1980, puts a lot of its garage doors right at the edge of the useful life for original springs and cable - 40-plus years is past what most manufacturers rate that hardware for, even with no obvious damage. Add the area's cold-moderate winters and the seasonal swings that come with them, and steel sections from that era show more rust at the bottom panel and more binding in the track from minor frame movement than newer doors do. It's not dramatic failure, usually - it's slow stiffening, a spring that's lost tension, a cable starting to fray where it wraps the drum. That's the pattern we see most on this side of the service area, and it's different from what we find in neighborhoods built after 2000.