Thank you for your reply, it is very helpful. Yes, both L and R analog channels have no output.
Great idea to try the digital output. -.I soldered in a coaxial cable to AVIP points 6 and 24 and it does have output sound over digital coaxial. I'm assuming this means the analog problem lies with the Filter/Amplifier Coupling Network, the WM9709, or the associated traces?
I have found the WM IC on the board but I'm still searching for the Filter/Amp.