At first I was expecting it to be some washed out political excuse but it genuinely is an issue, we have had Bombardier guys at Dalston and New Cross Gate on the platforms today grabbing drivers as they arrive and checking for issues with DOO cameras, there are some software glitches still. Occasionally a single camera will stop working, or all of them with the train at the minimum needing the desk shutdown / reopened and at worst tripping the auxillaries out and rebooting it.
As for the timetable thing, I may have been wrong over that, our current diagrams are showing workings up till midnight. However some of these workings might not be in passenger service (maybe just test running)