The most common call we get from this stretch of the corridor is a door that's slow to close, or that closes partway and reverses. On a commercial steel door with a chain hoist, that's almost always the opener straining against something mechanical - a spring that's lost tension, a track that's binding, or ice at the bottom seal doing exactly what we described above. The opener isn't broken; it's fighting a fight it can't win, and eventually it trips its safety reverse rather than force the door through.
A second pattern: a door that opens fine in the morning and gets noticeably harder to move by afternoon, especially in the colder months. That's usually spring fatigue on an older torsion system - the spring's lost enough tension that the door's weight isn't balanced anymore, so the motor's doing work it was never sized to do all day long.
Here's the honest limit: if a commercial torsion spring's original to an early-80s build and it's never been serviced, replacing it is usually cheaper and safer than trying to repair around it. We won't talk you into patching a spring that's due for retirement just to avoid a bigger ticket - a spring failure under load on a heavy steel door is a real injury risk, not just an inconvenience.