Enhaust burning floor

I have a 2004 40 foot Tiffin Phaeton. While under the motorhome doing some undercoating I noticed that there was white styrofoam exposed above the exhaust pipes and the turbo chargerand exhaust pipe area. it looked like the heat had deteriorated or burned whatever was between the styrofoam and the exhaust pipe. I assume this is under the bed and I will be.looking at it today for damage.from above. The exhaust has also burnt or melted some wire loom in the area above the exhaust. Is this something that Tiffin will take responsibility for and fix on the motorhome of this age?

Thanks
Ken Tenpenny