PHOTO: Casa Grande firefighters put out a blaze that started under a semi-trailer sitting next to a Casa Grande automotive shop on Monday afternoon. A CGFD unit responded to the scene behind the Pep Boys on Florence Boulevard shortly before 5 p.m. The fire appeared to have started beneath a trailer sitting in a paved area next to the store. The smoke then rose to blanket the trailer, but crews managed to get the fire under control shortly after.