1975 heavy-panel-bracket overstress
That eight-year gap matters on an off-track door: earlier construction here tends to carry heavier wood or wood-composite panels, wider door openings, and track brackets sized for that extra weight. When a roller jumps the track on one of these doors, it's often because a hinge has worn oval or a bracket has pulled loose under load that a lighter 1980s door never puts on its hardware.
