So, because they did this for you, do I understand you are willing to guarantee if I need a new motor when out of warranty, Bosch will replace it? Would you be willing to guarantee that they would even pay for half? Change it free if I bought the parts? Offer a discount on the job? No?
Assuming that their motors were as good as you so often claim, I have no choice but to wonder why YOURS needed to be changed? The fact it lasted through the entire warranty period before failing would USUALLY mean there was nothing wrong with it when you got it, leaving one to wonder if you didn't manage to abuse it?