VT45 Projector: Blue pixels throughout screen

Hi, This projector get regular use, 2-3 times weekly and recently started to exhibit a blue haze throughout the screen which eventually developed into seemingly random blue pixels. The blue pixels do not display on the screen when there is no input (the VGA input is all that is used) and the white NEC logo is onscreen. There is also a large area in the lower middle of the screen which when the unit is running without any input displays as a large yellow blotch. This blotch is also visible when there is video signal, and the blotch moves when the screen orientation is changed. I will be testing the svideo on the unit later today to see if the issue is related purely to the VGA. If anyone else has experienced these issues some suggestion to fix or what to repair would be greatly appreciated. Thanks