The first job on any Burbank call is figuring out if we're looking at a 1981-vintage setup or a replacement someone put in during the 2000s or later - the parts, the drum sizes, and the spring wind direction can all be different depending on which era you've got. We check the spring wire size and wind, the track alignment, the cable condition at the bottom bracket, and whether the opener's force settings have drifted enough that the door is straining the hardware every time it runs. On original systems we're often dealing with a single torsion spring where a modern double door would have two, which changes how we source the replacement. If the door is original hardware end to end, the repair usually means replacing more than just the failed part, because the rest of the system has logged the same decades of cycles even if it hasn't broken yet.