Marduke
Flashaholic
ANY reputable company will either allow you to PAY them to fix an out of warranty item or at the very least refer you to someone that can fix it for you.
Who? Most all dealers in my experience deal with warrantied parts only. Even if they have the knowledge or ability to repair parts which they did not produce, that is a huge liability.
I know that when something is broken, the concept of "can't make it worse" comes to mind, but try telling that to an angry customer if it can't be fixed.