What is the wiring harness that leads to the fuel injectors? on 2005 Chrysler Town & Country

I ma being told that the wiring harness lays on the exhaust and has partially melted. The mechanic says this wiring harness leads to the fuel injectors. But, the fuel injector itself is fine, spark plugs and spark plug wires are new and working properly. I have a 2005 Chrysler Town & Country Minivan.

the harness runs the injetor pulse if it is running fine then the wiring isnt melted right through but I would still repair the harness