You made the right decision...let us know how the new one goes when you get it.I think once the repair depots have the right parts (NOTE this is my OPINION).. then the issue is reduced significantly. IMO, the problem here (unlike normal repairs) is that repairs start a repair cycle/loop..
[doublepost=1503691356][/doublepost]FWIW.. Apple let me pay the difference and upgrade my RAM.. via going to the 2017 15" 2.9 15/512.. and I am stoked. I paid the difference in the models.. I am good for years.