On a door this old, the springs are usually the first thing to go, and on a narrow single-car opening the torsion or extension springs are often undersized by today's standards, which means they've been working harder than they should for years. Rollers on these doors tend to be steel, not nylon, so they wear the track grooves unevenly over time. Cables fray at the drum because the drums themselves are older stamped units, not the machined kind you'd find on a newer install. Openers get added on after the fact to a door and frame that were never built with an opener in mind, so the mounting bracket is often improvised, and that shows up as rattling or a door that reverses for no clear reason. None of this is a Berwyn-specific defect. It's what happens to hardware this age no matter where it sits, but the age is the constant here.