After the railtour of 18 October 2008, Defiance underwent a bogie and wheelset overhaul.
The loco was taken out of traffic in 2013 following the discovery of leaking cylinder liners. A top end power unit rebuild was carried out, along with replacement of the main and ETH generators with overhauled ones.<ref>[http://www.fiftyfund.org.uk/index.php/our-locomotives/50049-defiance Fifty Fund] (retrieved 21 January 2018)</ref> 50049 completed an its overhaul in April 2016 in time to work passenger services during the April 'Open House' weekend.
===50049 Defiance on the main line in preservation===