What's going on with my aging laptop's lcd

Full photo

If it's not clear from the pictures, there is this yellow/brownish stain all around the edge, and some spots.
It looks like i spilled coffee over it, but i really didn't. And the stain is not on the surface but under it.
It's an IBM a31p, with a 1600x1200 15.4" screen, I'm already on the lookout for a replacement screen, but not much luck yet.

I did find the ibm service manual at http://www.eserviceinfo.com/ though, cool site