I had the same type leak. Mine turned out to be the supply line rubbing on a metal edge of the fridge frame.
I unhooked the line from the water solenoid on the back of the fridge, cleaned the leaking area, cut a short section of larger gas line that just slid over the water line, then secured it with a small hose clamp on each end.
I you can't locate the actual leak point, replacing the line is your only option. Until I found my leak point, my plan was to connect a new line to the old, then pull the new through unaccessible locations.
2000 Winnebago Ultimate Freedom USQ40JD,
ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy