If the door shudders partway up and stalls, that's usually a spring that's lost tension, not the opener. If it opens fine but slams the last foot on the way down, look at the rollers - on a door this age they're likely the original nylon, worn oval instead of round. A loud bang followed by the door refusing to move at all is almost always the torsion spring failing outright, and on a double door built to older standards, that's not a DIY fix - the spring is under enough load to hurt someone. If the opener runs but the door doesn't move, that's a stripped gear or a disconnected trolley, and either one is a straightforward call. We cover Palmer from our Waxahachie location, about 10 miles out, so there's a drive time built into any same-day call - we don't stage a truck in town.