Once we're on site, the first job is figuring out whether the track itself got bent when the roller came out, because that changes the repair from a ten-minute adjustment to a track swap. A roller out of a straight channel is a quick reseat and a bracket tighten. A bent track section means pulling the bent piece and running a replacement, which is more time but still usually a single visit given what's on the truck.
We check both sides of the door, not just the side that failed, because if one bracket let go from thirty-plus years of seasonal movement, the matching bracket on the other side is usually close behind it. Replacing one and leaving the other loose just means a second call later.
Last step is cycling the door a few times by hand before we hand it back to the opener, watching the rollers track clean through the full run. On an older door from this era, that's the real test - not whether it closes once, but whether it tracks straight on the fifth and sixth cycle, after the opener's motor is back in the loop.