There's about 300 now left in 303/304.
By my reckoning there's about 1800 left in the 3rd Tier, the majority (about half) in the South Stand.
Less than 300 in the 2nd Tier
Less than 700 in the 1st Tier, by far the majority in 135/136/137 (500+available), in big blocks of seats towards the front of the stand.
In total there's about 2,800 to shift to sell out (including the returns from UEFA). The sold out signs should be going up over the weekend, which will be over a week before the game. For any Loserpool Echo reporters lurking, this will make your poxy "City struggling to sell out story" look a bit premature eh?