Kennewick's cold-moderate climate band puts real seasonal swing on steel and lubricant - not extreme cold, but enough freeze-thaw cycling that grease in an original 1980s or 90s torsion spring stiffens up and the metal fatigues faster than it would in a flat, mild climate. Add in that most of the roughly 19,085 owner-occupied houses across this service area were built during that same 1981-2000 window, and you've got a lot of garages running original hardware at the same point in its life cycle at the same time. That's why spring and roller calls cluster the way they do here - it's not bad luck on any one street, it's the whole area's housing stock aging out together. A household here with the area's $87,022 median income is usually weighing a repair against a door replacement at this point, and for most of these doors, the repair still makes sense - the panels and track are fine, it's the spring and roller hardware doing the work.