Any update on the issue Pyroboy?

A couple of things could cause what you see....like someone said, the ring gear could have ate the soft copper line. That could be because of the routing of the copper or an "OOPS!" when you wiggled the 3rd into the housing and smashed the copper line. You might be able to check that without removing the 3rd...just remove the brass bulkhead intermediate coupler(the blue air line is attached to it) and you should be able to see the fat black o-ring in the hole and the copper line should be sticking out about 1/8" inch. If you see no copper line at all then the ring gear probably grabbed it and sucked it into the housing.

I can't imag