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Thanks Scrambler. IT's been awhile for me as well and a bit of a language barrier, so was trying to break it down in the simplest form for the tech.Other than taking the phone apart to look on the circuit board, you might be able to log in via the CLI interface and go into LD 32.
You can do an IDU followed by the TN number. I'm not sure if it lists out the serial number. You might need to try the command FSUM.
It's been years since I last played with these old phone types.
Take a look at all the options in LD 32.
It might also be possible via a trace command in LD 80.
I haven't got any manuals to reference with.