WEST YARMOUTH — Nearly 40 residents of the Mill Hill Residence have tested positive for COVID-19, but most of the cases appear to be mild, officials at the senior living facility said. Brian Geyser, CEO of Maplewood Senior Living, which runs the Mill Hill Residence, said in a Friday evening email that Mill Hill has 39 residents who have contracted the virus. “Most affected residents are either asymptomatic or exhibiting mild symptoms,” Geyser said. “All affected individuals are doing well, and their families were contacted immediately,” he said. “The residents are in isolation with a dedicated team of senior clinical staff on-site overseeing and administering care,” he said.