[s-cars] front bumper cover help

[DGraber460 at aol.com]

I need to get my cover off to replace my inter-cooler on my 9 S6.
How does one get it to slide forward?
I have removed 2 bolts visible from the front through the grill, but can  
find no other securing bolts/screws, but it won't budge.
What have I missed? I have looked everywhere possible for  fasteners and 
found nothing obvious.
TIA
 
Dennis
Denver