We don't have a set price to give you here, and we're not going to invent one. What we can tell you is what drives the cost on an off-track repair for a door built around 1993: whether it's a single roller and bracket, or a track that needs to be pulled off the wall and reset square, and whether the cable or drum hardware moved when the door came off the rail.
A straightforward roller-and-bracket fix on steel sectional hardware is a small parts cost plus labor. A track that's bent or a jamb anchor that's stripped out of a settled slab costs more, because it usually means removing and reinstalling the whole rail section rather than just clipping in a new roller.
We inspect before we quote. No repair gets started on your door until you've heard the number and said go ahead. If we get underneath the door and find the spring system is also compromised - which happens more often when a cable has been running slack for a while - we'll tell you that separately before touching it, since that's a different repair with different risk.