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When I have tried to just fix one part of a two or three part plumbing connection, I could not convince myself that I could fix one "leg" without damaging something else. So...., I would cut out the three-way, add PEX extensions, and get a new "T" fitting, and crimp it into the extended PEX lines. My experience cutting the stainless steel rings off was probably a reflection of my newness to PEX world. Perhaps cutting off copper crimp rings may be less destructive, but I have not tried that side of the PEX usage.
Overall, my advice is to err on the side of caution: cut out the bad parts, measure carefully, and insert new fittings and new PEX line as required. Chasing leaks in a rig or sticks-and-bricks is usually not fun, so if you can minimize the weak points, go with new parts.
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