Aging 1990s extension springs
Birmingham's older stock still carries original one-piece doors and side-mounted torsion hardware that nobody stocks anymore - Hoover mostly doesn't have that problem. Instead, 1990s-era doors here are hitting the point where extension and torsion springs installed at construction are reaching the end of their cycle life, and the first-generation chain-drive openers from that era are starting to strip gears or lose their logic boards.
