Jd 2320 cooling line looks rusty

[AmericanJD]

I was washing the tractor down with the garden hose when I realized what looks like a rubber coating on the cooling line in front of the radiator and also just below where the battery sits has came off and is rusting. Tractor has less than twenty hours on it. Seemed like something I should bring up to the dealer to replace. I know heat would probably be the cause but I just hate to see rusty parts on my new tractor so soon. Any opinions on this? Thanks ahead of time!