Here is the key..
“The writing was traced in an oil slick from the auxiliary engine in the Boeing 747-4000 aircraft’s tail cone”
Lemme guess
The oil shouldn’t have been there, its a sign there could have been engine failure??
The writing was traced in an oil slick from the auxiliary engine in the Boeing 747-4000 aircrafts tail cone
Interesting...With "5" engines, no wonder they make such great freight haulers.../s