Seems all of the Durham-Coxhoe services have issues:
Bus 56 17:50 Durham Bus Station to Bishop Auckland Bus Station + 11
Bus 56 17:30 Bishop Auckland Bus Station to Durham Bus Station + 5
Bus 57 17:40 Durham Bus Station to Kelloe Morley Crescent + 9
Bus 57 18:11 Kelloe Morley Crescent to Durham Bus Station + 5
RE: Arriva North East: Latest News & Discussion - March 2015