Hemlock's houses went up mostly around 1969, and a lot of that original hardware is still on the door. Cable is one of the parts nobody thinks to swap out until it lets go, so if your house was built in that stretch, there's a real chance the lift cables holding your door up right now are the same ones the builder hung. Steel cable doesn't last forever even sitting still - the strands work-harden at the drum and at the bottom bracket every time the door cycles, and after fifty-some winters of that, the wire is thinner and more brittle than it looks. Add in the cold-climate swings this area gets, where the cable contracts hard on sub-zero nights and then takes on moisture as it warms, and you get corrosion starting from the inside of the strand where you can't see it. Nobody stocks a cable that matches original 1969 spool wire, so replacement is standard-gauge new cable, not a rebuild. If your opener has never had the cable inspected, and the house dates back that far, it's overdue - not because of anything you did, just because that's how old the part is.