All you need is the serial numbers from both units and a good explaination of why you feel your unit is not fixable - best would be to have a call logged with tech support, but if you have a valid problem that they will recognize as being non-fixable, and if you insist that you've followed all the advice from reputable forums, AND if you stick to your guns, they should take care of you. I don't know if the showstoppers are as easy to get transferred as a "normal" 2020, though. It seems like others have said before that they won't transfer a lifetime for a showstopper, so your mileage may vary.
Good luck