First thing we do is figure out whether the track is actually bent or just knocked out of alignment - those look similar from across the garage but need different fixes. A track that's simply out of alignment gets re-hung and shimmed against the framing. A bent track gets replaced; we don't try to hammer a track straight and send you on your way, because a track that's been bent once is weaker at that spot and it'll happen again.
While the door's open and the track's off, we check the rollers and hinges it's been riding on. On houses from this area's 1949-1993 building stock, it's common to find original steel rollers that have worn oval instead of round, which is often what started the whole problem - a roller that's gone out of round rides the track edge instead of the center and eventually jumps it. We'll show you what we find before swapping anything, including if the door itself is fine and it was just one bad roller.