Who to send it to?

I have a 135mm f/2 DC lens that has had the misfortune of taking a

hard whack.

Short version of the story...It was in my backpack when some one

moved it and knocked it against the edge of a door jam. ( I did not

kill them) Apparently the door jam met with the 135 in a not so

friendly way.

It hit hard enough to put a ding in the sliding lens shade. The ding

was big enough to lock the lens shade in place. I was able to

straiten out the ding enough to be able to use the shade again.

Now my big concern is I am seeing more CA then I did before. So I

would like to get the lens checked out and repaired if there are any

elements that are out of line.

So who do I send it to? Nikon because it is a DC lens? Or some one

else.

Sorry I should have said I am in Centrel Florida USA...my bad

Any suggestions are greatly appreciated...