I will try. Ive just been reading up in my Scott Spencer book, and theres a couple of ways I can go about fxing this. Bt both will take a while and no doubt will fail several times before succeeding. But will try. I can either retopologize in Zbrush, or build a new mesh in Maya, and reproject, as you say, in Zbrush. Both are going to need more than the fours sleep I had last night so will prob wait till wednesday!

edit - thinking about this, are you saying that you think its possible that I could just fix those holes and then reproject on those areas? because theyre underneath the model anyway so theres no actual detail on that area I want to keep anyway.