Hi Chris. Not sure if what I am going to post will enlighten, or confuse the issue further.
It seems to me that the problem is with the Posky 747-400 cargo model, probably from the original file.
I downloaded a B747-800 cargo model - Airbridge - and this was OK.
I then downloaded an original Posky 2004 file - a B747-400 cargo repainted by Mathieu Voss and the two offending textures were totally missing. See uploaded file.
https://simviation.com/phpupload/uploads/1650224740.jpgI then downloaded the official Posky repaint file for the 747-400 cargo version - B747-400v4Freighterspaintkit
I then took the texture OS747_Nose_Logo texture from the repaint file and added it to the Asiana Cargo texture.a folder, and reinstalled the aircraft.
The result is in this uploaded image.
https://simviation.com/phpupload/uploads/1650262303.jpgYou were obviously on the right track when you asked me to delete that particular texture. The problem could be that the texture you were using was corrupted?