This region sits in a cold-severe climate band, and cold is hard on old steel. A torsion spring loses tension and gets brittle with temperature swings over decades, and a house built around 1960 in Progress has been through roughly sixty-five winters of that cycle on the same spring. That's the failure we see most: not a dramatic accident, just metal fatigue that finally gives out on a January morning when the garage is coldest and the spring is tightest.
Across the wider area there are 132,270 households and 54,312 owner-occupied houses, and Progress's own 4,649 households sit inside that count - a small slice, but one with its own build year that doesn't match Harrisburg's newer pockets or some of the farther-out towns with more recent construction. A door swap written for a generic newer suburb misses what's actually hanging in a Progress garage: original hardware, original tension, and sixty-plus winters of cold-severe cycling that newer doors in other parts of the service area haven't faced yet.