On a door built around 2003, the first sign is almost always noise, not a jam. The factory plastic rollers that came standard on builder-grade steel doors wear down well before the springs or the opener do, and you'll hear a grinding or popping sound as the door travels, especially at the bend where the track curves up toward the ceiling. Cold-moderate winters here stiffen the factory grease on the roller stem and the bearing race, so a door that's quiet in July can start chattering once temperatures drop. Left alone, a worn roller starts to bind in the track, which pulls the hinge it's mounted to out of alignment and eventually cracks the hinge itself. That's the point where a $20 roller job turns into a hinge and track repair.