Hey gang, I am in need of some advice. Our 2015 Class C Thor Chateau Model 31E was purchased Sept of last year. I am noticing a faint propane gas smell from time to time coming from the LP fill area. ...
I'd whip out a wand and glycerine based bubbling stuff (soapy water works, but it corrodes stuff), and go at it like that.
It almost certainly is the regulator.
While you are at it, might consider installing an Extend-A-Stay kit. This way, you can use propane cylinders for additional propane, or attach an outside stove and use it from your rig's propane system.