Duane Dramen, a mechanic at the station?s Auto Service Center, uses a black light to check the Freon lines for leaks after mixing dye in with the Freon, here Aug. 22. - Duane Dramen, a mechanic at the station?s Auto Service Center, uses a black light to check the Freon lines for leaks after mixing dye in with the Freon, here Aug. 22.