AWM 126 notations

[Bruce Reeves]

Hi all
I have been struggling to identify what the red notes in the AWM register 126 for my Chev Blitz.
it is obviously a disposal record but I can't work out what the notation means.
It says "GMH SAN 4372" and the ARN is crossed through in red.

I would love to be able to track the life of the truck and this is the only link I have.
any ideas? cheers

Preservation/restoration is progressing :

rgds Bruce R