With the bonus that in our particular case, we were paying for the "labor" and getting the parts under warranty, which means that in the end I paid ~$1000 for repairs and LG claimed to have provided ~$1200 worth of parts (which is bullshit because an aluminum evaporator coil doesn't cost $400 unless it has a 20x retail markup). So, when they sent a check, it covered our sunk costs. But I had a fridge with a brand new compressor, evaporator, and condenser, as well as an upgraded control board/etc. This is part of the reason I took a crack and just ran it without the Yoder loop.
So, a couple of points: some other companies fix yoder loop leaks by bypassing them and feeding factory-provided heating coils through the now vacant line.
Also, the LG parts all had copper brazing points, so the tech never had to work with aluminum/steel directly.
Finally, I wonder, after your initial comment, if there was just a problem with the refrigerant charge, which was causing your fan to ice over as a byproduct because it was slightly under/overcharged from the factory.