(24 Nov 2015, 4:47 pm)DaveyBowyer wrote These are done by Deptford who are responsible for the Southern Division (CLS, Washington, Crook, Stanley and Peterlee). Riverside only do Percy Main and Hexham.
Chances are it would have been at Riverside for general maintenance.
If Washington don't have the staff available but Riverside do, the vehicle can be moved to the depot with staff available to undertake relevant maintenance.