We don't have a set number to quote you here, because what an off-track repair costs depends on whether it's a bent track, a stripped roller, or a hinge that sheared - and on a door this age, hinges and rollers sized for the original steel gauge aren't always the same part sold today. What we can tell you is the pattern: households in this end of the service area report a median income of $35,938, noticeably lower than the $81,346 figure across the wider Boone service area, and it shows in the calls - more owners here ask for the narrowest fix that gets the door running again rather than a full section or opener swap.
That's a reasonable call on a door from the 1970s if the track and panel are otherwise sound. It stops being reasonable once the track is torn loose from the framing or the bottom panel is crushed; at that point you're paying for a track repair and then paying again for a section a few months later. We'll tell you straight if that's where your door is headed, rather than patching it twice.