Windscreen out and found a bit of rust.
 

Had the screen pulled today as it was leaking and suspected a bit of rust lifting the seal. Turned out to be a bit more than I thought I'd find but all sorted now.

http://i162.photobucket.com/albums/t...psb41f7237.jpg

http://i162.photobucket.com/albums/t...ps13d29a22.jpg

http://i162.photobucket.com/albums/t...ps39265f81.jpg

http://i162.photobucket.com/albums/t...ps14b18177.jpg

http://i162.photobucket.com/albums/t...pse7fe4a48.jpg

http://i162.photobucket.com/albums/t...ps7ee13155.jpg

Prime & paint tomorrow and have a brand new screen in Friday.

My old blob had the same problem tiny bit of welding on the lip was done
http://i1326.photobucket.com/albums/...psda0dbe82.jpg

Has it been replaced before?

Yes mate 8 years ago that'll be when the paint got damaged originally.