Mission Viejo's housing runs from 1938 to 2015, but the median year built lands at 1983, and most of the stock across the area's named neighborhoods went up in the 1980s and 90s construction boom. That matters because torsion springs are rated for a set number of open-close cycles, not a set number of years, and a door that's been cycling twice a day since a tract was framed in 1986 is well past the point where the spring should have been swapped out already. Same with the opener. A lot of these houses still have the first or second chain-drive unit the builder put in, and those motors are now three to four decades old. On top of the age factor, the mild temperate climate here doesn't put the kind of thermal stress on steel that a freeze-thaw region does, so owners tend to assume the hardware will just keep going indefinitely. It won't. The failure mode in this area is almost always wear and fatigue catching up with original equipment, not weather damage - grease that's gone to varnish, bearings that have worn oval, a spring that's lost its temper after thirty-some years of flexing.