All looks good, nothing to be alarmed about.

Can you measure volts on your sound board, both DC and AC.

MM.

I will have to do tomorrow night.  Been doing stuff all day and had enough for tonight..Don't want to break stuff as this usually happens when I'm tired.

FYI...Everywhere I google on RGP etc about this issue, the number one thing is grounding.  Now, all board screws are in tight...Just for shits n giggles, I put the DMM on buzz and tested all grounds I could reach, within backbox & to earth pin on power plug.  No problems located and it appears that ground is getting from backbox to earth pin on power.