After cable replacement, Craftsman garage door won't "close", moves a few inches down, then back to further than it started
I have solved the issue. I unplugged the machine and moved the trolley to the end of the rail, as would be done during installation, and then let the door run. The trolley acted just as it ought to and my garage door is opening and closing, saving me a ton of money on a garage door mechanic. I am assuming, at this time, that the chain slipped up when the cable snapped, or that somehow the unit "reset" itself to thinking that the trolley was at the end.