Hello long time lurker first time poster here.

Anyways I have a 52 inch 720p LCD Rear projection unit by Panasonic. The other day I was dusting my set when I noticed a dark spot. The pixel grid is visible when close to the screen and through one square there is a diagonal black line. I am wondering if its a stuck dead pixel or trapped dust and what to do in any of those cases.

I purchased the set the day after Thanksgiving so it should still be under manufacturer warranty.

Thanks for any and all help.