Yes, all three "computer grade flat cables" were replaced. I did not do this myself, a highly qualified tech did it. I examined his work when I received the repaired unit back, and it looks like the same "point-to-point" wiring you'll find in most Chinese amps. The three flat ribbon cables were each replaced with numerous ordinary thin, round, insulated wires. In any event, it works.
I had also previously had the contacts cleaned and it worked for some time, then the problem occurred again. I sent the amp back several times to a tech (recommended to me by Roy Hall) in LA (from the East Coast to the West Coast) and that tech cleaned everything; and he pulled the cables off the pins they were pushed on to, cleaned the pins and cleaned the connectors at the end of the cables - the whole works. The tech told me that this was a common problem with the amp - the connection between the cables and the pins loosened over time.
After three times of this back-and-forth, I had had enough. When one channel dropped out again, I decided I would send it to a tech on the East Coast, pay whatever I needed to pay and have it fixed once-and-for-all. The tech on Long Island told me that he had worked on this amp many times before, and had replaced the flat cables and "hard-wired" the connections. I sent the amp to him, and after several weeks (and after he told me that it was turning out to be a really tedious job, and after he also tried ordering new connectors for the flat cables but these were not spaced correctly and had to be discarded) he entirely replaced the flat cables with the plain wiring I previously described. I suppose you could have someone wire it with silver cable or something exotic; I just wanted the amp to work without any problems. But as I said, the result was better than I expected.
I had also previously had the contacts cleaned and it worked for some time, then the problem occurred again. I sent the amp back several times to a tech (recommended to me by Roy Hall) in LA (from the East Coast to the West Coast) and that tech cleaned everything; and he pulled the cables off the pins they were pushed on to, cleaned the pins and cleaned the connectors at the end of the cables - the whole works. The tech told me that this was a common problem with the amp - the connection between the cables and the pins loosened over time.
After three times of this back-and-forth, I had had enough. When one channel dropped out again, I decided I would send it to a tech on the East Coast, pay whatever I needed to pay and have it fixed once-and-for-all. The tech on Long Island told me that he had worked on this amp many times before, and had replaced the flat cables and "hard-wired" the connections. I sent the amp to him, and after several weeks (and after he told me that it was turning out to be a really tedious job, and after he also tried ordering new connectors for the flat cables but these were not spaced correctly and had to be discarded) he entirely replaced the flat cables with the plain wiring I previously described. I suppose you could have someone wire it with silver cable or something exotic; I just wanted the amp to work without any problems. But as I said, the result was better than I expected.