Most ponies would say life in Stable 63 has never been that interesting. Wake up, eat, fix the algae tanks and irrigation lines, eat, fix the robots that were supposed to fix the tanks and lines, sleep, repeat.
Gear Heart would disagree. What more could anypony want? A technician and natural tinkerer, he loves his job of getting hooves deep into malfunctioning machines. Stable 63 was the as close to perfect as you could get. Well, except when his Boss wasn't putting the fear of Nightmare Moon into him, some malfunction is causing a panic, or his best friend is slowly killing him with kindness and sarcasm.
All that changes when an old companion comes to complain to Gear about something he found. Something that will have dire consequences not just for the Stable but the entire MidWaste as well.