Tigerwoods

Hi, I have a 2012 Q7 & the drivers side LED indicator cluster looks to be faulty as it contains condensation & some water. The faulty bulb icon is also now appearing on the dash. Audi (as always) won't cover this under warranty & want £600 to replace. I can obtain a salvage replacement for next to nothing but when I take the bumper section out to gain access to the retaining screws holding the indicator cluster in place, the screws cannot be accessed form thr front? There seems to be an air filter/cooler behind the cluser too, further resrticting the access to the screwheads. Any help or advice on how I can get better access would be a god send.
Thanks
Sean "the Tiger" Woods