Chanhassen's housing stock centers on 1993, newer than a lot of what we work on closer to Plymouth, so the failure pattern here is less about ancient one-piece doors and more about rollers that have simply logged thirty winters of cycles. A door that age has usually gone through two openers and a spring or two, but the rollers often get ignored because they don't fail loud - they fail gradually, as grinding, then sticking, then a track that's bent from a roller that finally seized. Cold is the other driver. In a severe cold climate band, grease thickens and plain bearings bind on the first hard freeze of the season, which is when we get the call that the door 'won't go up all the way' - nine times out of ten that's a frozen or flat-spotted roller, not the opener. Houses built in the early '90s around here also tend to have taller single-car and double-car doors than older stock, which puts more weight and more cycles on each roller over the door's life.