During May 2006, a limited mechanical overhaul programme to the units was initiated; this led to the installation of improved door mechanisms and upgrades to the electrics and Automatic Warning System (AWS) equipment. 314202 lost its classic Strathclyde orange/black livery (the last remaining operational multiple unit in Scotland to carry the old livery) in favour of the carmine/cream scheme when it passed through Glasgow Works at the end of November 2006. 314206 entered Glasgow Works on 20 July 2007. This was to be the final unit to receive a major overhaul, pending a decision on the future of the Class 314 units.