Any rv techs out there?

I have an issue with the propane system in our brand new 5th wheel. on our first outing we noticed that we had low flow from one of our tanks. on the second outing we could get no gas out of the regulator.

The camper has two tanks that feed into a seletor knob on the top of the regulator. there is also a flow indicator that turns green when there is gas present. I have removed theregulator and the two supply hoses. I can get aor flow throught theregulator but cant get anything through the hoses.

I am guessing that there is something clogging the hoses. i am just curious if there are any check valves in these hoses that can clog up.

sorry if there is not alot of detail i am typing on a tablet and its kind of a pain to keep track of what im typing.