DRXX - sorry, I may have misled you in that I do realise that the unchecked letters in themed lights must be one of the nine different letters in the introductory phrase, so even without cracking the theme or individually checking unches, there are not 11 alternatives at 24A, but there are three possibilities at 1D and two at 33D which can only be confirmed the long way round. Might bite the bullet tomorrow.