On a 1960s-70s door, the first thing we check is the spring setup, because extension springs on this era of door wear unevenly and one side often goes before the other, which throws the door off-level and chews up the tracks. We replace in pairs when the hardware calls for it, not one spring at a time, because a mismatched pair just fails again within a season.
Tracks on these older doors get bent from years of a car bumper tapping the bottom panel, and rollers that were steel from the factory have usually been swapped for nylon at some point - we check which generation of roller is actually on the door before we quote a fix, since mixing roller types on the same track causes binding.
Openers from this build era are chain-drive, and when the chain has stretched enough to slip teeth on the sprocket, the fix is a chain and sprocket kit, not a new opener. We only move to full replacement when the motor itself is the problem, not the drive mechanism.