Canon Fix for Excessive CA - Calibration or Adjustment

I have a 24-70L lens that I've had a few years and after some recent comparisons to a couple other lenses, it appears to have more red fringing than I would expect from an L series lens. It's probably been like this since I bought it and just recently shooting at f/2.8 of some high contrast shiny objects it became quite noticeable.

Anyhow I'm likely going to send it off to Canon to hopefully get it corrected. I am wondering if CA is corrected by a "calibration" or adjustment of the lens elements, and what might I expect for an estimate to correct it. I'm in the US on the east coast, so it will likely be sent to New Jersey.

Not sure how they will correct it, I think in some conditions it is prone to it, mine is quite bad in certain conditions.

Post some examples - there may not be anything to correct; there are very few lenses that show no CA under those circumstances.

CA can't be corrected.
Nearly every lens will show some degree of CA giben the right conditions.
It is a characteristic of the lens with some lenses producing more CA than others.

CA is controlled by the glass coatings and the placement of the lens elements...maybe the elements are off misaligned too much, or maybe you expect too much...

WhyFi wrote in post #10897100
Post some examples - there may not be anything to correct; there are very few lenses that show no CA under those circumstances.

Here's a test shot full sized and then with a crop of the problem. I tried several other lenses and only a Sigma 70-200 had some slight purple fringing, the rest really had no evidence of any CA. Yeah, if I shoot RAW I can remove it, but with a lens such as this, I just didn't think the CA should exhibit itself this much.
It is probably a harsh test example.

This was shot at FL=70mm, 1/160 @ f/3.5 ISO400. I have other shots at f/2.8 showing it slightly worse, this is just one that was on top of the heap that I grabbed quickly.

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Try zeroing out the magenta and purple silders in LR. That's what I've done in some cases. Sometimes it works, sometimes it doesn't...