Housing across the area runs 1960s-70s stock, median build year 1963, and that generation of door came with steel rollers on steel track - no nylon, no sealed bearing. Steel-on-steel wears fast on its own, and this region's cold band makes it worse: winter contraction stiffens the grease in the roller stem, the roller binds instead of turning freely, and it drags rather than rolls. A dragging roller doesn't fail quietly - it grinds a flat spot into itself and starts gouging the track, which is why we see roller calls climb every winter. Houses built in this same era across the 22 named areas we work share the same setup, so it's not a one-house problem, it's a housing-stock problem. Add decades of nobody greasing the stems, and by the time a homeowner calls, the rollers aren't just noisy - they're seized, chipped, or missing chunks of the wheel entirely.