Check out the website
www.rvleaks.com - SealTech Manufacturing. They have service centers all over the country. Their device pressurizes the inside of the Elkmont and leaks are immediately evident on the outside as bubbles in the surfectant they apply to all outside seams (same concept as checking for propane leaks). The cost to soap the outside of the trailer and pressurize is $250 + 110/hr. to seal any leaks found (costs in other parts of the country should be lower). We're hoping TM will cover this. Nevertheless, once done we'll have our Elkmont checked once a year.