Welcome to the world of RVing!
Some time back, a poster said we all bought a "RV Kit" and not just an RV. New or used, there are always repairs, big and little with any RV.
Low miles on an RV doesn't mean the same thing that it does on a automobile. Your 2013 coach is about 5 years old now, and will require some continuing maintenance, some of which no warranty will cover.
Not defending defects here, just saying there are many fail points with any RV. Roof leaks are among the worst. If you aren't handy, or willing or able to learn, you need to find a RV tech you can trust. Some just admit defeat and find a different way to travel!
Bad decisions make great stories!