Green and Blue Spots on my DLP Pan...

Hello,

I have a Panasonic PT-52LCX65 52" DLP TV. It's just coming up on 2 years. I noticed a green and a blue spot in the center of the screen. At first, it did not affect the picture, but now, it's coming thru. Nothing has changed...we have a DVR box from our cable company and a DVD/VCR Combo unit since day one. We have had some problems with the DVR unit and the cable company has reset/pinged it. What could be the cause and how do I fix it?

Thanks
Tracie