sl3204me

My engine wiring harness body mounted has been destroyed by engine heat on my 1995 SL320.The arm going to the air mass meter melted when I was jiggling the wire to test it.Oops! On the early 1995s this is a separate harness costing $570.The main engine wiring harness is only $475.Luckily that was replaced by MB under warranty in 1999.So my question is this to all of the master mechanics out there.How difficult is this particular harness to replace?
I have done 2 smaller harnesses and they were not too bad.This harness looks like it has about 15 connections on it.Thanks for any information that you can give me.