Where This Job Goes Sideways
Most of the houses we get called to in Melissa went up around 2015 or later, which means the cable and drum setup on these doors is almost always the builder-grade factory kit, not something a homeowner or a previous contractor swapped out. That sounds like a good thing, and mostly it is, but it means when a cable frays or jumps the drum groove, it's usually because the door has been running on the same undersized cable for close to a decade with nobody ever checking drum wear or track alignment.
The failure we see most in this stock is a cable that's worn thin at the bottom bracket, right where it takes the most flex every time the door cycles. It doesn't always snap clean. Sometimes it frays down to three or four strands and starts jumping the drum, which throws the door off level - one side drops half an inch lower than the other and the whole panel racks in the track. On a newer build that panel is still straight and true, so the rack shows up fast as a visible tilt, not a slow sag you might miss on an older door.
How We Fix It
We start by releasing tension on the torsion spring before touching either cable - that's non-negotiable, cables under load are the reason this isn't a DIY repair. Once the spring is locked off, we pull both cables, not just the broken one, because if one side failed from wear, the other side is on the same clock and close behind it.
We replace both cables as a pair, reset the drums so the door sits level on both sides, and run it through a full cycle to check track alignment before we call it done. On a 2015-era door the tracks and rollers are usually still in good shape, so this is typically a cable-and-drum job, not a full hardware overhaul.
What You Are Seeing
If your door is tilted, if one side drops faster than the other when you hit the opener, or if you hear a snap and the door won't budge, that's a cable failure. Fraying strands near the bottom bracket, a door that jerks instead of running smooth, or a cable visibly loose off the drum - all cable symptoms.
Don't force the opener if the door is stuck partway. On a torsion system a broken cable can leave the other side holding the full weight of the door under spring tension, and forcing it can make a bad situation worse.
