A customer brought their truck in with a knock in the driveline. They’d been running around the clock trying to get work finished before Christmas and just wanted it sorted. We fixed the knock and went to take it for a test drive — because that’s something we always do before handing a truck back. That’s when we spotted it. Fuel dripping onto the floor. Not part of the original job, but definitely not something you ignore. We traced it back to a leaking fuel fitting going into the fuel pump. One