My son calls, his door opener stopped working. Opened the door by hand, it came completely off track. It's a double so we take it apart and rehang by sections, replaced the rollers. Went to utube to see how to adjust springs and cables. Got it working by hand again.
Checked the receptacle, no power. Climb into the attic to check, a squirrel had cut a wire. Fixed wire, opener motor works, but it won't lift the door.