Serviceable torsion systems
That era means torsion spring setups are standard rather than the older side-mounted extension systems you'd find in older housing further east - which is good news, torsion systems are more serviceable, but it also means the springs themselves are thirty-plus years into a working life they were never meant to have. We see cracked spring coils, dry-rotted rollers, and chain-drive openers with circuit boards that finally give out after enough winters of condensation.