The complaint we hear most from this part of the territory is a rhythmic thump or grind that gets louder as the door moves, especially noticeable on the first and last few feet of travel where the door is moving through the curved section of track. On a door from the early 1990s, that's almost always worn nylon rollers that have flattened on one side, or the roller bearing has seized and the roller is now just dragging instead of turning.
A second version of this complaint is a door that hesitates or catches partway through its cycle, sometimes enough to trip the opener's safety reversal. That's usually a roller that's cracked through and is binding in the track rather than rolling smoothly through it.
What it isn't, most of the time, on a door this age: a sagging panel or a bent track from age-related settling, which we see more often on the pre-1980 stock elsewhere in the service area. Cedar Mill's housing is young enough that the track itself is usually still straight - it's the rollers that have worn out, not the structure around them.