The most common failure we see on openers from this housing era is a stripped gear inside the unit itself - a known weak point in chain-drive openers from the early 2000s that run for years without a tune-up. It's a quiet failure: the motor hums, the lights come on, but the carriage doesn't move the door. People often assume it's the door or the spring, and sometimes it is, but on a 2002-era setup the opener gear is worth checking first.
Cold-severe winters add a second failure mode: safety sensors mounted low near the floor can get knocked out of alignment by seasonal ground shift or a stray snow shovel, and an opener that won't close at all is usually that, not a motor problem. We check sensor alignment as a standard part of any install, old opener or new.
We won't install a new opener on a door with a broken spring or a bent track - the new unit will just fight hardware that's already failing, and it won't last. That's a repair we flag separately, not something we fold quietly into the opener job.