The service area sits in a cold-severe climate band, and that cold is hardest on hardware nobody's touched since it was installed. A torsion spring on a Chanhassen door built around 1993 has had three decades of winter cycling - steel contracting in the cold, expanding in the heat of a closed garage - and that's the kind of fatigue that ends in a spring snapping cold, usually on the first hard freeze of the season rather than mid-summer. Chain-drive openers from that era also tend to announce themselves with a grinding or slapping sound as the chain stretches, well before they fail outright. Because household income here runs higher than the area average ($138,034 against the area's $96,878, F7), we also see more owners catching these symptoms early and calling before a full failure - stiff pulls, a door that reverses on its own, a spring that looks stretched rather than snapped. None of that is unique to any one house, but on a stock this consistently aged, the pattern across the town is clear enough to plan parts around.