The complication we see most in Spotswood isn't the spring - it's what's attached to it. Openers installed in the 1980s and 90s on these houses sometimes used hardware that isn't made anymore, so a repair can turn into a partial replacement just to get parts that fit. We'll tell you before we order anything, not after.
The other one is the slab itself. Houses built in this era, on a 1965 median across the wider area, were poured before some of the current frost-heave standards were common practice, and settling over 55-plus years can throw a track out of square in ways that aren't obvious until the door's already jammed. Squaring that up sometimes takes longer than the spring swap itself.
One honest limitation: if your opener logic board is fried and the model's been discontinued, we may not have the exact replacement board on the truck. That part sometimes has to be ordered, and we'll tell you the lead time straight instead of promising same-day when we can't back it up.