Hi and welcome to the forum.
Hopefully, you got all of the manuals and service records along with the coach. You're probably on a Freightliner chassis. Typical service is annually or 15K miles and about every three years a more major chassis service is required.
Many people use Speedco for DP service but Freightliner also has a chain of "Oasis" shops across the country which specialize in RVs.
Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.
2007 Itasca Ellipse 40FD