The most common call out of this area is a broken torsion spring on a door original to a house from the early 1980s - the spring finally lets go after thousands of open-close cycles under constant heat exposure. Second most common is opener gear replacement on those same-era chain-drive units, which is a straightforward fix if the motor and logic board are still sound. We also get calls for track realignment, since steel track bent slightly out of plumb over 40 years will bind rollers and strain the opener even when the spring and motor are both fine. One honest limit: if a door's track or panels are bent badly enough, or the opener board itself has failed on an older unit, parts for some of these early-80s models aren't always stock items, and replacement can end up cheaper and faster than a repair that's waiting on a backordered part.