Houses in this stretch of the service area were mostly built between 1961 and 2010, with Milpitas itself centered closer to 1987 - solidly in that 1980s-90s wave that covers most of the nineteen areas we work across. That means the garage door hardware in a lot of these homes is original: the same torsion spring, the same steel track, installed once when the house went up and never touched since. Springs are rated for a number of open-close cycles, not for a number of years, and a door that's operated daily for three-plus decades is well past what its original spring was built to handle, even if it hasn't failed yet. Openers from that era, where they exist at all, are usually a second-generation chain drive without modern safety sensors, which is its own reason to replace rather than patch.