I have Gian reign 2 2013 since february and its a great bike. But few days ago I found a strange green line on the frame. And I am not sure if its a crack or not. You can see it across the weld. I uploaded some photos, but becous the flash from my mobile phone they are´t very good.
OK, if there is no paint cracked then that is probably not a crack. I would take a bit of sandpaper and polish the paint off in that area. If it is cracked it will become more visible. If it is just something on the paint, it will disappear.