Hello, Sadly I bought the wa7 second hand off ebay, I got the tp brand new. I contacted them about the led light and they wanted $70 us to fix it. But im in Australia so all up with return shipping it would be around $300 us (thats a fair bit of money for one led light). Still have to contact them about the windows 10 support, at first I thought I could solve it myself thinking it was drivers, But now I suspect its the wa7 at fault.
RCA mode works fine (apart from having a loose connection, it's the wa7 at fault, my rca cables fit tight with every other device I have.)
The cheapest thing I can do is try and forget my ocd and enjoy the wa7 in rca mode
. And just hope the led light does not turn off too much.