Welcometo the group and hope it never needs "fixing" but most do and the more we each know, the easier that fix may be!
So I will send along some links to things that may help educate you on the RV or maybe let you find some parts---before they give trouble!
Parts to see where it may be and how to get to things?
Plumbing is always a wonderfull thing to study?
And wiring of course?
Beyond blowing your mind (sorry!) one big first thought is the way batteries running down is a frequent problem for the novice Rv folks. Watch them carefully and try not to let them run down while not being used as that is a major point for lots of folks . One big item is that there are battery cutoff switches-----which don't actually cutoff ALL
the drains and things go downhill if we don't work to avoid killing good batteries!