Reminds me of an aircraft at Air Hanson circa 1988. A crew room conversation amongst engineers resulted in one engineer stating that G-1234 looked good with it's new car phone.
Blanks looks from the avionics engineers followed by an exodus to look at this new device.
Turned out that the owner had just called in the local car phone company who had installed it with no mod(obviously) and more importantly had drilled holes in the structure
(and wiring!!!) wherever they felt like it.
Much fun and expense sorting out the mess