The 02 Contessa is a great coach but If your not familiar with DP RV systems you'll save a little grief by using a good RV inspection company. You can google them, but I've used
https://nrvia.org/ in the past. The inspection includes fluids and recall info.
If you do it yourself, start with what you talked about but also Look for water damage around and above the entry door and windows, get service records if they have them.
Good Luck
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If it ain't one thing, Its something more Expensive
Bill & Cindy DFW South.....Midlothian TX
2002 Monaco Dynasty 400 ISL, Tag Axle, 2019 F-150 Toad