The class continued to suffer from reliability issues brought about by electrical and mechanical failures, and were later prohibited from running in multiple with the Mitsubishi DJ and General Motors DF locomotives, although they did sometimes run with the DJ class past this time. It was decided to start withdrawing those locomotives that had not been overhauled to provide parts for those that had, and so the first to be withdrawn, DG 765, was withdrawn on the fact it had a good engine block.