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Wiring Harness?

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Hello,
I hope this is the right place to post this.
Let me start off by saying that I know nothing about cars, which unfortunately doesn't stop me from trying fix things that break.

I have a 1998 Jeep Grand Cherokee Laredo. Recently had a mechanic come out to replace the NSS. He was unable to do so because he says all the wiring under there is corroded and needs to be replaced, but he is unable to tell me WHAT wiring exactly. He mentioned transmission and transfer case harness. Does anyone know what all wiring under there he may be referring to? I'm trying to look up parts but have no idea what to query.

Any help would be appreciated.
Thanks in advance for your time.
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