U46MKII - 1 input dead

Hi all,
I enjoyed this piece of hardware for a little while when suddenly input 1 (both channels of input 1) stopped working. I tried everything, and I mean everything to make it work (different mixers, computers, drivers, settings..........) but no go. As I'm bachelor of electronics, I'm certain that this is hardware fault. Can I get service document(manual) to try to repair it or do you have any other suggestions?
Tnx
Ivan
I enjoyed this piece of hardware for a little while when suddenly input 1 (both channels of input 1) stopped working. I tried everything, and I mean everything to make it work (different mixers, computers, drivers, settings..........) but no go. As I'm bachelor of electronics, I'm certain that this is hardware fault. Can I get service document(manual) to try to repair it or do you have any other suggestions?
Tnx
Ivan