When they use an O ring to seal on a turbo, they have a bad habit of springing leaks, not just on these critters either, but on just about any engine with that setup. If you want to save some future aggravation, what I always do whan installing those things is get them real good and clean with acetone ( finger nail polish remover ) and coat the new o ring and both mating surfaces Hylomar ( note, not the stuff sold under the permatex brand that's still floating around in a few places, you want the racing formula or the aero formula, if you orderred a tube from BSR you'd probably get it in 2 days as close as you are I usually get it in 3) If you coat both the pedestal and the turbo side do the whole flange and then pop that sucker together you will eliminate all possible variables on that joint for leaks
. So yes, disregard whatever I said before, its the o-ring in between the turbo and pedistal that might be causing the problems. I'm sorry you have to go digging in there and messing with the turbo to fix that....I dont wish that crap on anybody 
. Last time I did it I was in an unheated shop when it was 20* outside....talk about cold (for around here 
