AmeriCorps National Civilian Community Corps members are branching out yet again this week, replacing a shingle roof and cutting out a mountain biking trail at the Y’s Warner-Tully Camp in Claiborne County. Corps members are working to help the Y and to beef up their construction skills for other work across the Southeast. About 160 AmeriCorps volunteers from across the nation are in the city for the second year in the federal government-sponsored program based at the former All Saints’ Episcopal School on Confederate Avenue.