A door built in 1999 or later on a Saginaw lot sits in a service area where severe summer heat is the dominant stress, not cold. Lubricant that's fine in March turns thin and runs off bearings by August, and the heat cycling on steel panels and opener logic boards shortens the life of both faster than a mild climate would. Because the typical build year here trails behind some of the older 1980s-90s stock elsewhere in the service area, these doors are often still running their factory hardware - original rollers, original spring, sometimes the original opener. That's not a flaw, it's just the math of 1999 as a median build year: enough time has passed for wear to show, not enough for most owners to have replaced anything yet. Skipping maintenance on a newer door doesn't feel urgent the way it would on a visibly old one, and that's exactly why problems here tend to get caught late - the door still looks fine right up until a cable frays through or a bearing seizes in the heat.