Had all the filters changed once in that area, and the tech let the gasket fall off the air dryer filter before the filter was installed, and then tightened way too much, and air was leaking from there. I thought it was other valves around the air dryer, but it was the gasket not on the filter.
Coach ran fine, but once I stopped, and was at the rear of the coach, I could hear it.
Mark & Debra Wood, Las Colinas, TX.
2013 Entegra Aspire 42RBQ
2014 Jeep Wrangler Sahara