In the early 2000s, the remaining members of the class underwent a moderate refurbishment to extend their operational lives to 2012. The refurbishment largely involved a cosmetic upgrade of the exterior and interior of the cars, with new seating and a major mechanical overhaul. As part of this the cars received the new two-tone Tranz Metro blue livery with the exception of DM556 and its trailer cars D 2130 and D 2411 which were repainted into the old Midland Red livery with silver roof and black running gear in 2006. Trailer unit D 2660 was sent to Hillside Workshops for an overhaul in 2002.