Man that sucks big time. I wonder if the whole line has to be replaced, or is there some A/C tech magic that can 'splice-patch' that section of line?
(I'm thinking no such luck)
I will tell you that once upon a time when I was poor, young, & foolish enough to try, I put one of those 'steel putty' products onto a (exhaustively prepped) leaky, long line going to the rear of a mini-van (Voyager).... had it recharged. It had one of the mounting clamps for the line broken in a side impact collision a couple of years prior (which was undetected & unrepaired). The line was moving around until it wore a hole in itself against a frame member.
Long story short, I cleaned, sanded, patched with a small alum cover piece (to keep goop out of line) & then liquid steel goop all around, and crossed my fingers/held my breath. I figured it couldn't hurt to try (they wanted several hundred dollars for that line plus labor if I recall.... and that was food from the kiddies' mouths). Then took it to the place that found the leak & quoted the repair... had them evac & recharge (no guarantee of course). Guess what... it held fine as long as I owned it. Sold it a couple of years later & never looked back.
Yeah, I'm feeling the sun on my neck as we speak.
