For a door that wasn’t installed eight months ago customer called said the door was off track. When I got out on site, I noticed the cable had dumped and three rollers were out of the track. My diagnosis led me to believe the door froze to the ground, and when the door broke loose, the cable had dumped, causing the rollers to pop out. Once rollers were back in track and cable was back in track, operated the door, and it operated flawlessly.