Hello Trevor,
Sorry for the late reply.
I would first start with allignment of the 3kHz, 30kHz and 300kHz filters in the VR Module explained in the Service Manual. The trim capacitors get bad contact over time. I've written earlier on this issue. Left click on my name above this message and search for 2712. You will find more info there.
Good luck.
I will be glad helping you futher for as far as I can.
Jaap PA0JRK
