Welcome to the forum its a great place to get your questions answered. I'm not really following leak outside? Sounds to me like you have some fitting leaking inside your rig there is no one that will know the actual problem without investigation I don't understand your concern about having a RV tech look for the leak. Contact FR or ask your dealer to do it and see if they will cover the cost of a mobile Tech.
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho