Need tahoe help again guys, you know who you are

Guess I jinxed myself. I'm still trying to find the leak in mine, so I went to pull the rear HVAC out to check it out and the high side line is froze solid. just had it out 3 1/2 years ago and all was well then with no zigns of any problems, but now I have the high side line broke off and won't budge out of the stell nut.
 
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