First we check whether this is a torsion or extension-spring door, since Aztec's older housing stock still has a fair number of the latter. On extension-spring doors we release tension carefully, pull the old cable off the drum, and check the drum grooves for wear before fitting new cable - reusing a grooved drum just frays the new cable again within a season. On torsion doors we do the same check at the cable drum near the torsion bar. Either way we check both cables even if only one has failed, because uneven wear usually means the second one isn't far behind, and swapping one cable at a time on a 1978-era door that's been deferred this long is how you end up back here in a few months. We test the door through a full open-close cycle under load before we call it finished, and we'll flag any spring or bracket wear we see so you know what's coming next, even if it's not part of today's job.