Today I sprayed the inside of the cabinet while the grain filler is still on the outside.
I used Mohawk "Dark Red Mahogany" #M101-0227 and sprayed the entire insides. I then used Mohawk "Extra Dark Walnut" #M101-0209 on the bottom and the aft edges where the back gets screwed to.
Then I used a small touch up brush and brushed on some black in the cooling holes on each side along with the knob cut outs etc. For this I used Mohawk "Black Satin Lacquer" #M104-S224.
Here are a couple of pictures of the inside. One before and one after.