You will have to do a pressure test, or have a dealer do one...Close up the slide outs, all the windows, roof vents and tape shut the shower and sink drains. Open up one baggage door or window (or equiv...) that communicates with the Rv's interior, then cut-out a cardboard template and duct tape tight to this only opening. Cut hole in cardboard just large enough to insert a reasonably powerful leaf blower (elect may be best) and run on high speed. Go atop roof and using a spray bottle with a soapy water solution spray seams and joints and watch for bubbling...
Best Regards,
3 tons
