I'm surprised she manages the 24 on an almost daily basis. That seems to be her allocation both before and after repaint/rebrand.
Waverley Road is quite steep, but she manages it fine (see here, here and here for shots if you're unfamiliar with Waverley Road). Often makes a few odd noises, but other than that..!
Having said that, in the past two days, she has been taken out of service early twice while being on the 24 for two different reasons...
I think Bazza's thinking behind the "TEN" backup was that 3941 has been away for so long now, leaving 3942 to be the only designated spare (forgive me if I've got that the wrong way round - it's early and I can't be bothered to check). It obviously isn't permanent, but I understand what he means. Hopefully 3941 should be back on the road by August though...
RE: Go North East