I'm sorry but there simply is no way of giveing you the answers you need but my knee jerk is,there was no rubbing line but one that was improperly soldered during reassembly after compressor. If there was a line rubbing,it points directly at improper install or poor adjustment during compressor. This might indicate inept techs but that can only be confirmed or ruled out while inspecting the system. At any rate I don't see how Trane's responsibility should extend beound furnishing new parts.

Thanks for the follow up. To clarify: the leak 100% came from the metering tube being in contact with the other line and having a hole rubbed through. That was the opinion of the tech and is pretty clear when looking at it. The lines are in good shape, but you can clearly see the spot where the two lines were touching and rubbed together from the vibration of the unit.

What isn't clear is how the metering tube ended up in a position to be rubbing against the other line. My guess is that it likely got pushed over during the compressor replacement. I suppose it could have been that way from the factory, but I don't think it would have taken 6 years to rub through. The system is now up and running and the tech secured the lines so they wouldn't touch. But I am still out well over $1000 for the second time in less than a year. And one thing is certain - I had nothing to do with the line being in a position to have a hole worn through it. So I'm sure you can understand my frustration after paying nearly $10K six years ago only to have to pay $3000 over the last 6 months.