An off-track door is almost always a track, roller, or bracket problem, sometimes all three once one lets go. On the older end of Pittsford's housing - homes going back to 1938 - we run into steel track hung on brackets that were never built to today's spec, paired with rollers that have worn oval instead of round. On the newer end of the area's stock, doors built through the 1970s and 80s, the track itself is usually fine and the fault is a bent section or a stripped bracket screw from age, not design.
We carry standard track sections, sealed and unsealed rollers, and mounting brackets on the truck. What we don't stock is a match for every original bracket pattern from the late 1930s - some of those are long out of production, and if the original hardware is too far gone, the fix is a new bracket run, not a salvage.