It was originally gold, and I thought it was trans fluid (Transmax Z is gold) but it was just new oil as it gradually got darker, and the fact all the PS stuff was completely spared. It also gets all over the hard trans lines and where they connect to rubber joiners so I've had many "Ah I bet its just XYZ!" to be found no, sorry, it is not XYZ.
This is what I thought too, the highest oil was on the merge point of the top and lower cover, I can't think of anything else it really could be, hence the post because I r n00b