The service area sits in a cold, severe winter climate zone, and older torsion springs that have already done sixty-plus years of expansion and contraction in that cold are more likely to fail without much warning - usually on the coldest morning of the year, when the steel is stiffest and the grease has thickened. On a 1963-era Orange house, we're often looking at galvanized springs rated for a lighter door than whatever's hanging there now, since doors have gotten heavier and better insulated over the decades while the spring never got upgraded to match. We check the drum and shaft alignment on these jobs specifically, because track brackets from that era were set for thinner doors and don't always hold square once a heavier replacement panel goes up. If your door is original to the house, don't wait for the spring to snap - have it checked before deep cold sets in.