I also had a power supply go within about 2 weeks of being new on a Hypex. They replaced very fast, I think I had the new supply within 3 days of contacting them. It was obviously well within warranty at that point. I don't know if it was a power cap I just don't even remember at this point.
In any case I found especially with a Dual mono case it did run rather hot, and I know many disagree with this. Mostly the plates on the SMPS supplies were very hot. I put real heatsinks on those plates, and never an issue again, plus they ran pretty much barely above room temp. after. That amp is running strong for 3 years now with a little mod on those power supplies.