The complaint we hear most from North Tustin is a door that won't stay up, or one that slams the last foot of travel instead of settling. Houses through this area went up mostly in the 1965 range, a few years ahead of the wider service area's 1970 median, and that earlier build date usually means the original torsion spring - if it's never been swapped - is now near or past 60 years old. Springs don't fail on a schedule, but they do fail in that stretch of life, and a snap on a heavy wood-panel door from that era comes with almost no warning. A door that drifts down on its own, or one where the opener strains and reverses partway up, points the same direction: the spring has lost tension long before it actually breaks.