Arcadia's median home dates to 1965, a few years newer than the 1959 median across the rest of the service area we cover from Pasadena. That gap matters more than it sounds. Doors built in the mid-60s here tend to run on extension springs with separate safety cables, or early torsion setups with lighter-gauge lift cable than what you find on the older 1940s and 50s stock six miles west. A snapped lift cable on one of these doors usually means the door drops crooked on one side rather than dropping straight, because the cable and spring system on these homes isn't matched the way later torsion setups are.
We pull the old cable, check the drum or pulley it rides on for wear grooves, and replace the cable with the correct gauge and length for the door width and lift type - not a universal cable off a shelf. On extension-spring doors we also check the safety cable running through the spring, since that's the part that keeps a broken spring from becoming a projectile. If the drum or pulley is chewed up from the cable jumping its groove, we replace that too, since a new cable on a damaged drum just fails again.