Thanks for the reply. Yes I added those vents, there are also a number of large holes cut for wires to pass through. I took and reversed the fans - to draw air out and it seems to have made a difference. In addition I took the PlayStation and blew all the vents out, three years of accumulated dust was hurting the cooling efficiency. I think my nest step is a 3" holesaw to increase the size of the holes for the fans and seal them to the back a little bit better. Thanks for your suggestion.