OP

Quoted from pinballinreno:

Most of us have applied a filter over the LED strip in the backbox

Either a 1/4 CTO stage gel sheet in 2 layers to equal 1/2 CTO (available in most arts and crafts or lighting stores) or online at a few places:
amazon.com link »
Or use 1/2 CTO stage gel:
amazon.com link »
Cut a 20 to 24" length 4" or so wide strip. Tape it with 1" segments of 1" gorilla tape to the backbox over the light with the light being somewhat centered under the film.
You only have to hang it over the LED strip, so you dont have to tape the bottom or side edges.
This will give you the right color that matches the screen and kill off all the blue from the LED.
Its a 10 min reversible fix (but no one will ever go back the the ugly colors).
Adding this filter seems a little redneck, but it comes out really perfect.