Your rigger may be spot on with all of his findings and recommendations but they're so extensive that I'd be inclined to get a second opinion. In particular, I would question the apparent conclusion that your mast is unsafe and unsalvagable. Masts can be repaired. If the sleeve is covering a problem and if it was improperly done, it can be removed and replaced with something that is less likely to create a stress riser. It's worth a shot.
Jim Fulton
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