How to fix a chunk error on my minecraft server?

I have a server running of 1.7.2 and a few weeks ago it just crashed. From that point on anytime players flew to close to the spawn no matter where at in the spawn area. The server stopped rendering, commands quit working, and it would crash. The only way to be able to log back in is to delete all temporary data and re op yourself and fly back. I have exhausted all of my resources in trying to fix this and i'm giving up. Does anyone know how to fix this or salvage my spawn? I will do anything it takes to have this server back. I appreciate any help, many thanks

There are two ways to repair the chunk.

The easy one is, if you have WorldEdit. Then go to the border of the chunk, and mark //pos1 and //pos2 at the other diagonally opposite border. //expand vert for all and finally //regen
As I read your post, you know the coordinates of the chunks?

The other method is to take the server offline and edit the map with a map editor to delete the corrupt chunks.

This is of course the short term solution, but you need to find the root source to the corrupted chunks.
All the best!

The problem is that the chunks are the same chunks from the original server and arent out of place so i have no way of telling which ones are bad but it seems like no matter where i'm at when i get to close to the spawn it stops rendering after about half of the spawn has loaded. I've also tried both those methods with no luck =