Mike, I'm not sure what The IA did; however, it sounded like it was a shielding issue. I could be wrong, I will ask him.
My memory is a little hazy, but the shield on the p-lead must be properly grounged at the magneto connection. Mine came ungrounded on a long trip to CN northwest and I could not start the engine, so I disconnected them, started and flew home. (Of course, the danger on the ground is a hot prop.) Not sure about how to explain static/noise due to p-lead shield problem.