I had our Sealtest done on our former Funfinder 210WBS at an RV dealership in Osprey, Florida near Sarasota. They found two leaks around the windows. I think the cost was around $110 or so. There are a few sites on the internet and on RVNet that show a do it yourself like here:RV.Net Open Roads Forum: Truck Campers: Do it yourself pressure leaks test???(Compleated)