Arching Horizontal Green Lines

My JVC AV-48WP30 is about 5 years old.  This morning I turned it on and green horizontal lines that bend towards the four corners of the screen appeared.  The picture is still there but the colors are shadowed and the number of green lines seem to be greater under lighter objects appearing on TV.  (I.E.- faces, white shirts).  I looked at the convergence screen but all the crosses show proper alignment.  Any help or ideas would be greatly appreciated. Especially anything I could do to it myself..