I'm really sorry to hear your experience. I do understand your point of having 2700 identical APs working fine and just one failing, I agree that there is a good possibility that this is a hardware issue.
On returned equipment that failed in a customer situation, Aruba does an analysis to find out what failed and why in order to improve the hardware and software quality. That requires a standardized output from the controller for each access-point, which is the show tech-support on the controller in this case. Hopefully, you can help TAC with that information, and in my experience, they will process a replacement pretty fast. If there is a software issue, and you can resolve it without replacing the AP that is probably faster for you as well. TAC is committed to serving our customers at the highest levels.
If you, for any reason, are not satisfied with the support from Aruba TAC, please contact your local Aruba sales team and use the TAC escalation procedure as described in the TAC Quick Reference Guide.