Traitor Mechanic

Life is always busy at Slim's Mechanic Shop. But ever since a rival repair store opened up across town, things have seemed even more chaotic than usual. Simple repairs have started going wrong; instead of new headlights, that old Jeep was sent out with six new belts. The bus with four broken windows was cleaned up and given diamond-studded tires. Is it possible that someone is deliberately throwing a wrench in the works? Could one of your co-workers be... wait for it... a Traitor Mechanic?