I have have good luck with wd-40 (or other penetrating oil) and a propane torch. A little heat, a little wd-40, and using a "flare nut" (tubing) wrench. Go slow,... and wiggle the wrench back and forth. You might want to soak the nuts a couple times an let them set. Also when you install the new ones,... use never seize on the nut threads.
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