The fault we see most in San Leandro isn't a modern opener glitch - it's the original spring hardware finally giving out. A lot of these doors still run on extension springs mounted along the horizontal tracks, stretched and released with every open, with no containment cable holding them if they snap. That setup was standard when the door went in and never got swapped out, because nobody thinks about a spring until it breaks.
San Leandro's housing stock centers on 1959, a few years earlier than the broader service area's 1965 median. That gap matters more than it sounds. Houses from this run tend to have narrower garage openings and lighter steel doors than the stuff built even a decade later, which means the spring sizing and the track spacing are often non-standard by today's parts catalog. You can't grab a universal spring off the shelf and expect it to match - somebody has to measure the coil wire and wind count off what's already hanging there.