Yes Ken Ralston is the guy you are talking about. He mentions that there were last minute changes to the frigate scene at the end of TESB. However, I am unable to confirm as to whether any preview audiences saw the film before these changes were made. Harrison Ford remembers sitting in one preview screening to judge the impact of the 'I know' line, so I guess it's possible. Though this version would undoubtedly only be seen by preview audiences and not the general publuc.

I am now in contact with someone who may be able to provide some more info. I will post in due course.

JD