In article .com,
(Joe Waddell) wrote:

Has anyone every heard of this before? Could someone explain to me
what a Pilot Light is?

It's just a light used as an indicator; nothing more than that. If it is a
filament lamp (like a torch bulb) then I cannot see how it would cause the
interference you mention, but if it is a Light Emitting Diode (LED) then
it could be the source and I suspect it should have some sort of filtering
capacitor and resistor across it.