Well, the UCLA film and television archive has it. I'm not sure what their policy is for non-students -- you may have to pay -- but it can certainly be viewed in their instructional media lab on campus.
From looking at the Meyer papers, I have a couple of (seemingly contradictory) documents related to the reshoots.
The first is a shooting schedule for days 54-57 of principal photography (scenes marked as either ADDED or RETAKES), set for January 26-29, 1982. I'm not 100% sure what these scenes are, since the descriptions (i.e. "Saavik lets hair down. Attacks, rapes David.") are nothing but misdirection.
The second is a pair of script pages titled 'STAR TREK II -- RETAKES 3/23/82.' These include several scenes, including the revised Kirk/David fistfight.