Yeah client was pretty pissed. We installed his system about 3 years ago. I spent most of my time there convincing the client it was an easy fix and that it wasn't going to affect efficiency, longevity, nor will it even be visible. After I peeled back the fins I realized the hole was a bit larger than it originally appeared... rather mangled.... Peeled back some more fins, cut out damaged section, spliced in new section. Battabing.
Tech was very grateful... He didn't feel comfortably repairing it himself, which was fine. I would've guided him through the repair but, client was watching, it was getting late, and I didn't want to run the risk of him burning the thin tubing.
And yeah, gas + refrigerant + labor + overtime = not a very happy boss the next morning.